PDF malware analysis — malicious · d7a90d3fa95c83a8

MALICIOUS

PDF

3.91 MB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: fba727271543f9f19f7ff7da33f90bfd SHA-1: 10f8aff840c5daef9d9ea5496b7915fe51b354be SHA-256: d7a90d3fa95c83a87c353ee9689b4db33072fa4ee51e27c635976edfcc83ce54

438 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages multiple known Adobe Reader vulnerabilities, including CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The JavaScript stager is designed to execute malicious code by exploiting these flaws. The heuristic firings strongly indicate a multi-CVE exploit kit targeting Adobe Reader. No specific family could be identified, but the attack pattern is consistent with exploit-based document delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9014

Heuristics 12

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
PDF metadata arithmetic JavaScript stager high PDF_INFO_ARITHMETIC_JS_STAGER

PDF metadata hides JavaScript as arithmetic character-code tokens inside document information fields, then a launcher rebuilds it with String.fromCharCode and eval. The decoder is gated on metadata access from the launcher, a large arithmetic token table, and recovered exploit-like JavaScript.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `a28c73af7acf6bdec17541e93038535ccb8927f1ada8d12183e966cd72122abe`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	844 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`stream_043_off000697e0.bin` `f747afbf73807e984452b72f1a6d46e72c1c92837cb84ea83779b0d3ea560a93`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x697E0	90090 bytes
`stream_157_off000d971c.bin` `7f6dfcf2d8b8fc8e3cd5af73d880dd25d4a04cfef0d5b45902db17a342d5a4e1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD971C	57486 bytes
`info_arithmetic_stage_000.js` `3c1c6ad51c750dc043c6793a6efd8740c663cae741f9b1bcce198934e65ddedc`	deobfuscated-js	PDF /Info Title arithmetic JavaScript at offset 0x409	3728 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_cff_off000070f7.bin` `cb8d2f8532343cc7da2d3dc33186d07bf32cb5b4f418331d669ba3a4ed70f0cf`	pdf-font-stream	PDF embedded font (cff) at offset 0x70F7	4602 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.