PDF malware analysis — malicious · eed4d9e08901d9e5

MALICIOUS

PDF

20.4 KB Created: 2010-03-15 21:18:32 Authoring application: T0pycmny6qjX94 (via vrs8AjilyTjpS)

MD5: f24cb8da6ece1c2661d8b89a2b5812eb SHA-1: 6fac1b0bf4d835141270dedc699a8b9a168cb9fa SHA-256: eed4d9e08901d9e5fe793d2541d7a365a3ec534988017f1168fa6ec2bb75c898

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream is heavily obfuscated, utilizing String.fromCharCode and an eval() call, indicating an attempt to hide malicious code. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be the execution of this obfuscated JavaScript, which likely downloads and executes a second-stage payload.

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.
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_obj0007_000.js` `e58d957ba3815e148d3e52b47ddbca98cebcf5cc63fcd30b99ea278505435237`	pdf-javascript-stream	PDF /JS object 7 at offset 0x246	19691 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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