PDF malware analysis — malicious · 81ecd717f2e0cfd4

MALICIOUS

PDF

4.2 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: dc6c9dee4f57f83b98add5a159284a06 SHA-1: c85eeb39fb06098e73cc36cf1d88fb6ba5165c4f SHA-256: 81ecd717f2e0cfd49c01ed95c57de565c45e3dc28057d285c692f4ba7cea40cc

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains embedded JavaScript that leverages CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf) to exploit vulnerabilities in Adobe Reader. The JavaScript is heavily obfuscated using String.fromCharCode and eval(), indicating an attempt to hide malicious code execution. The primary goal appears to be the execution of arbitrary code, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `4735974f056761b0458c2f42fc8a0a66a1f94e06256a481576757e877c2746f7`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	12877 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `97ae48267bd0bf781e53d8723a9fe46b3010b23b0b5b3d21c1e2f165b053cecf`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x423	3856 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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