PDF malware analysis — malicious · e805c01cfb5a1ae0

MALICIOUS

PDF

29.3 KB Created: 2010-02-16 15:12:06 Authoring application: dPaVvXwazXIrwJapA (via tprDMNhqsUVHBopgj)

MD5: ea4bc49abcafdfae524d49c4144672e5 SHA-1: f00a23ea743b0f9d92ad8213ab2c3a669584c767 SHA-256: e805c01cfb5a1ae0b3a9a2cf80459238957144da5b8cf75e7b9b75332133ce32

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The JavaScript stream, named javascript_obj0015_000.js, is heavily obfuscated and uses String.fromCharCode and eval() calls, typical for attempting to hide malicious code. The likely intent is to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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_obj0015_000.js` `e47c607c8657a51cf0f12cbed86a9ffd88638f74fd236db8ed9698b9a41591e5`	pdf-javascript-stream	PDF /JS object 15 at offset 0x38FF	14479 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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