PDF malware analysis — malicious · f38c588f29b9b28c

MALICIOUS

PDF

3.7 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: c0aa339dd64b1436113f69cc6df352d7 SHA-1: dc3f94b7668048c053260e0d35362e7c1f0f6f9e SHA-256: f38c588f29b9b28ceed20a10eab87dbbad7d972dd1e258eae7c219f89324cf11

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript with eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The JavaScript stream, named 'javascript_obj0013_001.js', is the primary artifact for analysis. The obfuscated nature of the script prevents a detailed analysis of its specific payload, but the presence of these techniques strongly suggests it's designed to download and execute a secondary malicious payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ce54ca89471671ec5994243b67e54189839d2cbb86d461b6d0b2d6cbe0c11909`	pdf-javascript-stream	PDF /JS object 13 at offset 0x360	4315 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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