PDF malware analysis — malicious · 95ebc69186841b3d

MALICIOUS

PDF

2.8 KB

MD5: f9d0e4bc691cae6ee34f7f0c41265787 SHA-1: f45c7390b3aaa2c454caa710a5336a8f5b9c6242 SHA-256: 95ebc69186841b3d7048de1117f62e04040a891286e511b7ea6538691244fcbf

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are suspicious and likely responsible for executing malicious code. The exact functionality of the JavaScript is obfuscated, but the presence of eval() and String.fromCharCode suggests dynamic code execution, typical for downloading and running further payloads.

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` `a86707ccf5b92b441a4b97c1112cc7d8fb0485fcad4fb1f0be3249ac696746e3`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `bb2338fb2efd3e1ec797708c0c2bfaebb1b090f9bef53e0c9b4ff011f20d0cac`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3351 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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