PDF malware analysis — malicious · 2b9ae8bd67c17ac9

MALICIOUS

PDF

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

MD5: 6aeb2aebb174344a531b6b67fdfee0aa SHA-1: b25f5535fdb65a405d3732c98452adfc5f2ca553 SHA-256: 2b9ae8bd67c17ac94f924a6d63969b28fe44aab390978c8348374f2083817164

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript triggered by the OpenAction, which is a common technique for exploiting PDF viewers. The critical CVE-2007-5659 heuristic indicates the use of a specific vulnerability (Collab.collectEmailInfo) to decode and evaluate obfuscated JavaScript. This script is designed to download and execute a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic and the presence of deobfuscated JavaScript streams. The confidence is high due to the specific CVE identified and the clear exploitation chain.

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)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact high 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.
String.fromCharCode medium PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically (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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `f8b36c705810f86d0d2a663e2b9685593a209af53debccfadd2276eb98cf318f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13251 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `ee39f1540c63a2e859752230c9d7c61ebd61158e27207140fbb8adf0653e2793`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4020 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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