PDF malware analysis — malicious · 51a907388b26edbc

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: 5f337dd88eb5a4ba2fec3323dd607ea5 SHA-1: 050a162b445f75e14369c15d9186710f075ab3ea SHA-256: 51a907388b26edbcb30f3cdef8dd0cbdc20eee8bfecc80cdd73541933bc3bb02

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The JavaScript stream, named 'javascript_obj0013_001.js', appears to be obfuscated and uses 'eval()' and 'String.fromCharCode()', suggesting it's designed to execute arbitrary code. The primary function of this script is likely to download and execute a second-stage payload, although the exact mechanism is obscured. The file's metadata indicates it was authored using Scribus.

Heuristics 5

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `2c82b3d475a909d24859db7adf733cc5c41a4423c6028e638f4a9e7f246c4b57`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D2	8810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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