PDF malware analysis — malicious · 4a98a242f3c63caf

MALICIOUS

PDF

54.2 KB Created: 2009-09-24 05:16:10 Authoring application: MipOwirEVDLYbwgg (via RnIudFMRaVbtHclLZN)

MD5: f39c29bc632ca4ae9cc9ba6865930bec SHA-1: 7de38b438fc10f1d83670be83822bad3fe1d05a4 SHA-256: 4a98a242f3c63caf035f1c360c98d0cd60f7566d17c3fbc4e71e2a4f599b491f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL heuristics. The ML classifier also flagged it as malicious with high confidence. The embedded JavaScript stream, named javascript_obj0007_000.js, is likely responsible for downloading and executing a second-stage payload. The obfuscation and use of eval() suggest an attempt to evade detection.

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_obj0007_000.js` `d6b7ee3951830567c241e7d5203088d8feddedfbf85a622345e7a372b14e3925`	pdf-javascript-stream	PDF /JS object 7 at offset 0x51E	53466 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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