PDF malware analysis — malicious · 7ef5c0472494f4f4

MALICIOUS

PDF

3.6 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 1296f6ea9c2d4841b4f0c7e3a4348dc8 SHA-1: 784d3ff2de357f17eb4a137dcb2a877a81e6bb51 SHA-256: 7ef5c0472494f4f453e7b2c1b3a26b14074ad9632ab9bac4849db7739324bc3a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, which is flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL due to the presence of an eval() call and String.fromCharCode usage. The ML classifier strongly indicates maliciousness. The embedded JavaScript file, javascript_obj0013_000.js, is suspicious due to its size and obfuscation indicators. The primary attack pattern involves executing obfuscated JavaScript, likely to download and execute a secondary payload, which is a common technique for initial access or further system compromise.

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_000.js` `cb69e0a271995b72f01631be885876530649420e70d057cb65b115fe014b97e5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	4250 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 11 long base64-like blob(s).

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