PDF malware analysis — malicious · f2a7acb0b37209f9

MALICIOUS

PDF

2.8 KB

MD5: e4f2f3a2455e67fa5b80268d901845ab SHA-1: 3ae2797f0239dbc206b2e1f96c68507e29ff0f65 SHA-256: f2a7acb0b37209f925a132d6b4a000f3dd8ec5592dea8aab0ab6de3766b12db3

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and String.fromCharCode() for obfuscation. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript streams are likely responsible for downloading and executing a secondary payload, contributing to the overall malicious intent of the document.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `bb6d1d4ebc06c4a2b5d6b069b802a702a5ed7497568173cd1a5b05f8df96f861`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `2fb576ab75683ce3a9e777c9acc2b9c8a9b4e765bd49d672d56fe7fd13b561a2`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x266	3285 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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