PDF malware analysis — malicious · c8d266d52332fbdb

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: fc1d0797e31a11de916afe71202a9c32 SHA-1: bf0522e1d916b1f16083aee556ce0bf35b39e7c6 SHA-256: c8d266d52332fbdbf8c9253bacc6a17d0b63d9f0389c11458e4cce5f12762124

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript that is triggered by the OpenAction. Heuristics indicate the use of eval() and String.fromCharCode, along with a specific CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function. This suggests the script is designed to deobfuscate and execute malicious code, likely downloading a secondary payload. No specific family could be identified.

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)
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` `e72fc17bc5d3083c41579dee0f51f83197b864f67054f6b2a3d29182c9220ad9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13315 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` `3d17cc346377601b87dbfc6570d4c0c61ad0fe01abe4a6155d957a7feab1c507`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	3972 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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