PDF malware analysis — malicious · ccfe5bfb1cb7a4af

MALICIOUS

PDF

9.8 KB Created: 2009-10-04 13:45:55 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 3267c1a61334395ab072e6e3d9fca1d8 SHA-1: 4d727eae1385dee5764ac1c867c57644c04e14ee SHA-256: ccfe5bfb1cb7a4af15dedf6e56654e081c26a29d64caf74793c78fc828da4044

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF was flagged by ML classifiers and ClamAV as malicious (Pdf.Dropper.Agent-7305144-0). Heuristics indicate the presence of JavaScript within the PDF, including obfuscated code and calls to unescape() and String.fromCharCode(). This suggests the script is designed to download and execute a second-stage payload. No specific family could be identified, but the dropper behavior is clear.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7305144-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7305144-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `c4d3dc9251b41548764f8fb8ebbdc369810d4683dca774ecbfb381e0afc34783`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	11272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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