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# SpamAssassin rules file: Pdfinfo rules
#
# Please don't modify this file as your changes will be overwritten with
# the next update. Use /etc/mail/spamassassin/local.cf instead.
# See 'perldoc Mail::SpamAssassin::Conf' for details.
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
#
###########################################################################

# 2014-12-02 - axb
# Info and disabled rules kept for historical & documentation reasons
# Updated rules may be added
#
# Original File: pdfinfo.cf
# Original Version: 0.6
# Info: $Id: pdfinfo.cf 895 2007-07-27 10:31:08Z alexb $
# Created: 2007-06-25
# Modified: 2007-07-19
# Original / Defunct Site URL: http://www.rulesemporium.com/plugins.htm#PDFinfo
# Author: Dallas Engelken (aka GMD :-)
# Rules contributed by Alex Broens
# Requires: PDFInfo.pm plugin
# Description: This plugin/ruleset combination will help you alleviate the new
#              PDF based stock spam which began to appear mid-June, 2007.
#
#
# Changes:
#
#   0.6 - added easypdf producer rule and more no body text metas
#       - tags support added, see USING TAGS below.
#   0.5 - added fuzzy test 7
#   0.4 - added new fuzzy for encyprted pdf image spams.
#       - added rule to check for encryption
#   0.3 - added rules based on the new pdf_match_details() function
#       - added additional fuzzy md5 rules
#       - disabled static md5 rules as they are no longer hitting.
#   0.2 - added static md5 to hit full page stock spam.
#   0.1 - initial ruleset.
#

############################################
# USING TAGS
############################################

# The follow tags can be defined in an add_header line
#
# _PDFCOUNT_    - total number of pdf mime parts in the email
# _PDFIMGCOUNT_ - total number of images found inside pdf mime parts
# _PDFVERSION_  - PDF Version, space seperated if there are > 1 pdf attachments
# _PDFNAME_     - Filenames as found in the mime headers of PDF parts
# _PDFPRODUCER_ - Producer/Application that created the PDF(s)
# _PDFAUTHOR_   - Author of the PDF
# _PDFCREATOR_  - Creator/Program that created the PDF(s)
# _PDFTITLE_    - Title of the PDF File, if available
# _PDFIMGDIM_   - If PDF Contains images, the dimensions of them will be put here
# _PDFIMGAREA_  - The total area of all combined images inside the PDF(s)
# _PDFMD5_      - MD5 checksum of PDF(s) - space seperated
# _PDFMD5FUZZY1_- Fuzzy1 MD5 checksum of PDF(s) - space seperated
# _PDFMD5FUZZY2_- Fuzzy2 MD5 checksum of PDF(s) - space seperated
#
# Example add_header lines
#
# add_header all PDF-Info pdf=_PDFCOUNT_, pdfimg=_PDFIMGCOUNT_, ver=_PDFVERSION_, name=_PDFNAME_
# add_header all PDF-Details producer=_PDFPRODUCER_, author=_PDFAUTHOR_, creator=_PDFCREATOR_, title=_PDFTITLE_
# add_header all PDF-ImageInfo dim=_PDFIMGDIM_, area=_PDFIMGAREA_
# add_header all PDF-Md5 md5=_PDFMD5_, fuzzy1=_PDFMD5FUZZY1_, fuzzy2=_PDFMD5FUZZY2_
#

############################################
# GENERIC RULE EXAMPLES SHOWING EVAL USAGE
############################################

# you can match by name
# body          MY_TEST_PDF             eval:pdf_named('mytest.pdf')

# or you can write a regex to match dynamic file names.
# body          MY_TEST_PDF             eval:pdf_name_regex('/^(?:my|your)test\.pdf$/')

# you can make it case insensitive by using modifiers
# body          PDF_IMGXXXXX            eval:pdf_name_regex('/^IMG\D+\.\.PDF$/i')

# you can do exact image size matches
# body          PDF_DEMS_150_400        eval:pdf_image_size_exact(150,400)

# you can do image to text, or image to html ratios
# rawbody       PDF_TO_HTML_RATIO       eval:pdf_image_to_text_ratio(0.000, 0.015)
# body          PDF_TO_TEXT_RATIO       eval:pdf_image_to_text_ratio(0.000, 0.008)

# you can do minimum demension matches
# body          PDF_SIZE_RANGE_1        eval:pdf_image_size_range(300,300)

# you can do ranged demension matches
# body          PDF_SIZE_RANGE_2        eval:pdf_image_size_range(200, 300, 250, 350)

# you can count the number of pdf mime partts
# body          PDF_MIME_COUNT_1        eval:pdf_count(1,1)
# body          PDF_MIME_COUNT_2_PLUS   eval:pdf_count(2)

# you can count the number of images inside the pdfs
# body          PDF_IMG_COUNT_1         eval:pdf_image_count(1,1)
# body          PDF_IMG_COUNT_2_PLUS    eval:pdf_image_count(2)

# you can determine pixel coverage
# body          PDF_AREA_SMALL          eval:pdf_pixel_coverage(1,100000)

# match a md5 or fuzzy md5 signature of the pdf

# body          PDF_BAD_MD5             eval:pdf_match_md5('C359F8F89B290DA99DC997ED50117CDF')
# body          PDF_BAD_FUZZY           eval:pdf_match_fuzzy_md5('7340821445D975EEF6F5BDE2EC257900')

# Now you can match against certain details if they are found in the PDF.
# A regex match is used on the value specified, so if you want to do an
# exact match, use anchors  ^value$
#
# body          GMD_AUTHOR_MOBILE       eval:pdf_match_details('author','/^mobile$/')
# body          GMD_PRODUCER_GPL        eval:pdf_match_details('producer','/(?i)^gpl ghostscript/')
# body          GMD_CREATOR_PSCRIPT5    eval:pdf_match_details('creator','/^PScript5/')
# body          GMD_TITLE_WORD_DOC1     eval:pdf_match_details('title','/^Microsoft Word \- Document1$/)
# body          GMD_CREATED_JULY07      eval:pdf_match_details('created','/^200707/')
# body          GMD_MODIFIED_JULY07     eval:pdf_match_details('modified','/^200707/')

ifplugin Mail::SpamAssassin::Plugin::PDFInfo

#######################################
# DISABLED RULES, ENABLE IF YOU WANT
#######################################

# Small area
# Disabled - Hits Ham
# body          GMD_PDF_SMALL_AREA      eval:pdf_pixel_coverage(1,100000)
# describe      GMD_PDF_SMALL_AREA      PDF Area covers 150k pixels or less
# score         GMD_PDF_SMALL_AREA      0.75
# counts        GMD_PDF_SMALL_AREA      51s/15h of 10615 corpus (5652s/4963h AxB) 06/25/07

# NOTE - people do send pdf's without message bodies!
# Disabled - Hits Ham
# body          GMD_PDF_NO_TXT          eval:pdf_image_to_text_ratio(0.000, 0.005)
# describe      GMD_PDF_NO_TXT          Low rawbody to pixel area ratio
# score         GMD_PDF_NO_TXT          0.01
# counts        GMD_PDF_NO_TXT          64s/3h of 10615 corpus (5652s/4963h AxB) 06/25/07

####################################
# HERE ARE THE LIVE RULES
####################################

######################################################################################################
# pdf image dimensions

# thin horizontal, common stox.
body            GMD_PDF_HORIZ           eval:pdf_image_size_range(100, 450, 240, 800)
describe        GMD_PDF_HORIZ           Contains pdf 100-240 (high) x 450-800 (wide)
score           GMD_PDF_HORIZ           0.25
# counts        GMD_PDF_HORIZ           135s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PDF_HORIZ           278s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07

# near square, and small.  common stox.
body            GMD_PDF_SQUARE          eval:pdf_image_size_range(180, 180, 360, 360)
describe        GMD_PDF_SQUARE          Contains pdf 180-360 (high) x 180-360 (wide)
score           GMD_PDF_SQUARE          0.50
# counts        GMD_PDF_SQUARE          36s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PDF_SQUARE          46s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07

# thin vertical, very tall.  common stox.
body            GMD_PDF_VERT            eval:pdf_image_size_range(450, 100, 800, 240)
describe        GMD_PDF_VERT            Contains pdf 450-800 (high) x 100-240 (wide)
score           GMD_PDF_VERT            0.90
# counts        GMD_PDF_VERT            24s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PDF_VERT            10s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07

######################################################################################################
# static checksums

# all static md5 spam runs are complete as of 7/11
# if there are more, we'll add new rules.

# removed fuzzy rules dated 2007
# Get fuzzy info:
# cat msg.eml | spamassassin --debug pdfinfo  2>&1 | grep fuzzy 2>&1

# sample rules ONLY
# fuzzy checksum for bad stox
#body            GMD_PDF_FUZZY1_T1       eval:pdf_match_fuzzy_md5('57EBC1FFB1A24CC14AE23E1E227C3484')
#describe        GMD_PDF_FUZZY1_T1       Fuzzy MD5 Match 57EBC1FFB1A24CC14AE23E1E227C3484
#score           GMD_PDF_FUZZY1_T1       0.001

# same as rule above using fuzzy md5 of pdf structure
#body            GMD_PDF_FUZZY2_T1       eval:pdf_match_fuzzy_md5('653C8AA9FDFD03D382523488058360A2')
#describe        GMD_PDF_FUZZY2_T1       Fuzzy MD5 Match 653C8AA9FDFD03D382523488058360A2
#score           GMD_PDF_FUZZY2_T1       0.001

######################################################################################################
# pdf_match_details()

# from embedded link spam
#body            GMD_AUTHOR_COLET        eval:pdf_match_details('author','/^colet$/')
#describe        GMD_AUTHOR_COLET        PDF author was 'colet'
#score           GMD_AUTHOR_COLET        4.50
# counts        GMD_AUTHOR_COLET        1s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts        GMD_AUTHOR_COLET        2s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07

# from full page pdf stock spammer.
#body            GMD_AUTHOR_MOBILE       eval:pdf_match_details('author','/^mobile$/')
#describe        GMD_AUTHOR_MOBILE       PDF author was 'mobile'
#score           GMD_AUTHOR_MOBILE       2.75
# counts        GMD_AUTHOR_MOBILE       2s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_AUTHOR_MOBILE       55s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07

# txt only stock spam
#body            GMD_AUTHOR_OOO          eval:pdf_match_details('author','/^openofficeuser$/')
#describe        GMD_AUTHOR_OOO          PDF author was 'openofficeuser'
#score           GMD_AUTHOR_OOO          1.75
# counts        GMD_AUTHOR_OOO          1s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts        GMD_AUTHOR_OOO          118s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07

# txt only stock spam
#body            GMD_AUTHOR_HPADMIN      eval:pdf_match_details('author','/^HP_Administrator/')
#describe        GMD_AUTHOR_HPADMIN      PDF author was 'HP_Administrator'
#score           GMD_AUTHOR_HPADMIN      0.25
# counts        GMD_AUTHOR_HPADMIN      105s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_AUTHOR_HPADMIN      27s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07

# generic rule for software used to produce the pdf.
body            GMD_PRODUCER_GPL        eval:pdf_match_details('producer','/^(?:gnu|gpl) ghostscript/i')
describe        GMD_PRODUCER_GPL        PDF producer was GPL Ghostscript
score           GMD_PRODUCER_GPL        0.25
# counts        GMD_PRODUCER_GPL        227s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PRODUCER_GPL        85s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07

# generic rule for software used to produce the pdf.
body            GMD_PRODUCER_POWERPDF   eval:pdf_match_details('producer','/^PowerPdf 0\./')
describe        GMD_PRODUCER_POWERPDF   PDF producer was PowerPDF
score           GMD_PRODUCER_POWERPDF   0.25
# counts        GMD_PRODUCER_POWERPDF   0s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts        GMD_PRODUCER_POWERPDF   0s/0h of 5641 corpus (4064s/1577h AxB-MANUAL) 07/11/07

# producer is bcl
body            GMD_PRODUCER_EASYPDF    eval:pdf_match_details('producer','/^BCL easyPDF/')
describe        GMD_PRODUCER_EASYPDF    PDF producer was BCL easyPDF
score           GMD_PRODUCER_EASYPDF    0.25

# simple check for encryption used inside pdf.
# recommend meta with something else...
body            GMD_PDF_ENCRYPTED       eval:pdf_is_encrypted()
describe        GMD_PDF_ENCRYPTED       Attached PDF is encrypted
score           GMD_PDF_ENCRYPTED       0.60
# counts        GMD_PDF_ENCRYPTED       13s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07

# simple check for empty msg body when there is one or more pdf attachments present.
body            GMD_PDF_EMPTY_BODY      eval:pdf_is_empty_body()
describe        GMD_PDF_EMPTY_BODY      Attached PDF with empty message body
score           GMD_PDF_EMPTY_BODY      0.25
# counts        GMD_PDF_EMPTY_BODY      1638s/20h of 27034 corpus (24636s/2398h AxB-MANUAL) 07/19/07
priority        GMD_PDF_EMPTY_BODY      2000  # workaround for Bug 8070

######################################################################################################
# metas
#meta            __GMD_PDF_CHECKSUM      ( GMD_PDF_FUZZY1_T1 || GMD_PDF_FUZZY2_T1 || GMD_PDF_FUZZY2_T2 || GMD_PDF_FUZZY2_T3 || GMD_PDF_FUZZY2_T4 || GMD_PDF_FUZZY2_T5 || GMD_PDF_FUZZY2_T6 || GMD_PDF_FUZZY2_T7 ||GMD_PDF_FUZZY2_T9 || GMD_PDF_FUZZY2_T10 || GMD_PDF_FUZZY2_T11 || GMD_PDF_FUZZY2_T12 )
#meta            __GMD_PDF_DETAIL        ( GMD_AUTHOR_COLET || GMD_AUTHOR_MOBILE || GMD_AUTHOR_OOO || GMD_AUTHOR_HPADMIN || GMD_PRODUCER_GPL || GMD_PRODUCER_POWERPDF || GMD_PRODUCER_EASYPDF )
meta            __GMD_PDF_DIMS          ( GMD_PDF_VERT || GMD_PDF_HORIZ || GMD_PDF_SQUARE )
meta            __GMD_PDF_PRODUCERS     ( GMD_PRODUCER_GPL || GMD_PRODUCER_POWERPDF || GMD_PRODUCER_EASYPDF )

# rule hits ham by itself, so use just to meta.
body            __GMD_PDF_NO_TXT        eval:pdf_image_to_text_ratio(0.000, 0.005)

# meta checksum hit with image dimensions
#meta            GMD_PDF_STOX_M1         ( __GMD_PDF_CHECKSUM && __GMD_PDF_DIMS)
#describe        GMD_PDF_STOX_M1         PDF Stox spam
#score           GMD_PDF_STOX_M1         3.25
# counts        GMD_PDF_STOX_M1         159s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PDF_STOX_M1         40s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07

# meta checksum hit to pdf details
#meta            GMD_PDF_STOX_M2         ( __GMD_PDF_CHECKSUM && __GMD_PDF_DETAIL )
#describe        GMD_PDF_STOX_M2         PDF Stox spam
#score           GMD_PDF_STOX_M2         2.95
# counts        GMD_PDF_STOX_M2         223s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts        GMD_PDF_STOX_M2         29s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07

# meta dimensions and encryption
#meta            GMD_PDF_STOX_M3         ( __GMD_PDF_DIMS && GMD_PDF_ENCRYPTED )
#describe        GMD_PDF_STOX_M3         PDF Stox spam
#score           GMD_PDF_STOX_M3         2.25
# counts        GMD_PDF_STOX_M3         12s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07

# meta checksum with no text
#meta            GMD_PDF_STOX_M4         ( __GMD_PDF_CHECKSUM && (__GMD_PDF_NO_TXT || GMD_PDF_EMPTY_BODY))
#describe        GMD_PDF_STOX_M4         PDF Stox spam
#score           GMD_PDF_STOX_M4         2.95

# meta no body text along with automated pdf production.
#meta            GMD_PDF_STOX_M5         ( __GMD_PDF_PRODUCERS &&  (__GMD_PDF_NO_TXT || GMD_PDF_EMPTY_BODY))
#describe        GMD_PDF_STOX_M5         PDF Stox Spam
#score           GMD_PDF_STOX_M5         1.00

endif

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✏️ 20_pdfinfo.cf