PDF malware analysis — malicious · e430d3976c426f16

MALICIOUS

PDF

5.2 KB

MD5: c2c762fcaeed75e07a4f57b9e47173f3 SHA-1: eecaf4b4c4aa06d5655f22a7ca3c9e759c49e3a7 SHA-256: e430d3976c426f1692f2ab3bafbab4cf8bb01538cd823c9d20157586fa830a84

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. The presence of 'PDF_EVAL' and 'PDF_FROMCHARCODE' indicates the script is heavily obfuscated and likely uses dynamic code execution. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file 'javascript_obj0013_001.js' is the primary artifact, and its obfuscated nature suggests it's designed to download and execute a secondary 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` `5ea38357f30b1bd2e44cff9a8b90bb2a64ebce43a1f6caccceee7eff2c27ad14`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9183 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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