PDF malware analysis — malicious · df9c8de9c267d013

MALICIOUS

PDF

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

MD5: 114dbc8f29459a44db94af0f7b61ea3e SHA-1: ec7fd9f7ab4314ad4996b4efb2094f21b30447f7 SHA-256: df9c8de9c267d013ac036c1738cea1cadf12425fffd7b25f867c43d36cd6ffb1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains embedded JavaScript. The JavaScript stream is obfuscated using unescape() and String.fromCharCode, indicating malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the presence of an extracted JavaScript file. The specific payload or its ultimate destination could not be determined due to the obfuscation.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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` `f1ace4f81aafbe23a202495fa3a7c44b69345d64d1c74f1c14073d266538b076`	pdf-javascript-stream	PDF /JS object 13 at offset 0x1917	12615 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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