PDF malware analysis — malicious · a487d8028e75a9e7

MALICIOUS

PDF

4.6 KB

MD5: ac6f5c834c92a9a0d37659bee5ffabbe SHA-1: 7f98a5bf700738491deab5a76508f32d0f94d4e5 SHA-256: a487d8028e75a9e75eb25dc35ea7f4a9c1d06819828a3c5ca119323ea6d56957

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The JavaScript stream, identified as 'javascript_obj0002_000.js', is heavily obfuscated and contains eval() calls and String.fromCharCode, suggesting it's designed to download and execute a second-stage payload. The lack of readable document body text means the specific lure cannot be determined, but the technical indicators point to a downloader or droppper functionality.

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. (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_obj0002_000.js` `8301bf449c9644b7163cc058f501b10515797eadc729b1f7a2bf6c7c0acfce17`	pdf-javascript-stream	PDF /JS object 2 at offset 0x7B	87205 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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