PDF malware analysis — malicious · eecc391e8410f638

MALICIOUS

PDF

5.1 KB Created: 2008-12-03 13:57:41 UTC

MD5: f1e5aa71ff2f65a7cf553ee011e2632c SHA-1: d11986c578723c7f5a05c097f5454aeff06b2e54 SHA-256: eecc391e8410f638b207e03e79fde7357c386552c6bc87c1901399bfa54ba3d6

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream features an eval() call and uses String.fromCharCode, indicating obfuscation and dynamic code execution. The ML classifier strongly suggests maliciousness. The primary attack pattern involves executing obfuscated JavaScript, which is likely designed to download and execute a secondary payload, 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_obj0006_000.js` `60252fb92e6ce1cbf69fdf965136ec70d4a8b8b16812595634708a2c5a82480f`	pdf-javascript-stream	PDF /JS object 6 at offset 0xC5	8536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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