PDF malware analysis — malicious · 4b529f80bd32ba7b

MALICIOUS

PDF

3.0 KB Created: 2008-08-03 07:51:49 -09:03 Authoring application: Adobe InDesign CS3 (5.0) (via Adobe PDF Library 8.1)

MD5: 39dc88e6c935b040ee52bc6ed4d8ba6b SHA-1: fa76b3b8c9ba66995811ba91b2e091dd135dec81 SHA-256: 4b529f80bd32ba7b7e31058dced129474c9d6c614ce651110932f234cc349f55

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj0013_001.js', is likely responsible for executing malicious actions. While the exact behavior of the script is not fully detailed, its presence and the ML classification suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0013_001.js` `edcd6511b4798681c80eb7e31d4ecbe423962c1bbe27efd6ac5f0506e61a49e9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x35A	2613 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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