PDF / .TXT malware analysis — malicious · 234ca405b7da803b

MALICIOUS

PDF / .TXT

4.1 KB

MD5: f96c03478b3c2d75a6ba3f22d0df898a SHA-1: ad7a4ba3bf5777fbf3271f2e4082e1bea4c020c6 SHA-256: 234ca405b7da803b5775445dd2d5c65716758702e59f7df861401f24a2885edd

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is obfuscated and uses eval() and String.fromCharCode functions. The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obscured. The presence of obfuscated JavaScript and the ML classifier's high confidence score point to a malicious PDF designed for code execution.

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` `7d6327dc7a43c1d3ff6139c5d757113988ba4121b14dafefe04bc7f42afa7259`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6405 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` `51cc6be97b4bd535d3abe70e1703c196026d0ed042fb0274444a51852fd8fce7`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3649 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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