PDF malware analysis — malicious · 943b2d597a4bbd90

MALICIOUS

PDF

23.1 KB Created: 2011-72-51 03:25:00

MD5: fad20190e32e802de563390cc0c6dd54 SHA-1: dd185b58bb8181625079e665d74229f025e18def SHA-256: 943b2d597a4bbd90268049f6bad3d6f12dd153d9e6729c646b3c029292caafce

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL due to the presence of an eval() call. The ML classifier also strongly indicates maliciousness. The embedded JavaScript, named javascript_obj0001_000.js, is likely responsible for executing the malicious payload, though its exact function is obfuscated. The file is therefore classified as a malicious PDF downloader.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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_obj0001_000.js` `a323e0e55dcb202beadba27a5f42ee798f11b53d7f80e76d11f4f83f9f71ce74`	pdf-javascript-stream	PDF /JS object 1 at offset 0x589E	716 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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