PDF / .TXT malware analysis — malicious · 360d79a0ef23771d

MALICIOUS

PDF / .TXT

4.1 KB

MD5: ffb62ea1b19ca2f52082a795517413d7 SHA-1: e5b4fa91be8e30cb8fa70482497acd22c3533acb SHA-256: 360d79a0ef23771db718187da556aaf8352865e6511d7bb6c1ee452e88d36d2c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is heavily obfuscated and utilizes eval() and String.fromCharCode(), indicating an attempt to hide malicious code. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript, 'acroform_b64_00.js', is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured. The presence of these elements suggests a common PDF-based malware delivery technique.

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_obj0013_001.js` `3bb24a8cd845c5ea6c3fb9ece03ebab508bf584fbcc399d09e8795c3dbc25319`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6369 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `854dbc52475d8bbeaa3dd09a29cfb82fe36c83b817ca8979174777b090c47e52`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3624 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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