PDF malware analysis — malicious · 51a952d6f95e75f5

MALICIOUS

PDF

4.7 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: e0cc21f0b303f83eb735a7ee83fe2705 SHA-1: 9223c550041dfb626a7a54aa462759a55d96b9ec SHA-256: 51a952d6f95e75f5869c4dd4a11aaf4a28ada783945aca8894303e860b8f41cf

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file 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 file, 'javascript_obj0013_001.js', is likely responsible for executing malicious code, potentially downloading a second-stage payload. The obfuscation within the script prevents a more detailed analysis of its exact actions.

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_obj0013_001.js` `14ffb9926b806885a063bbffebb30162713d31e128d4cbfdb900a0439c225ef9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x365	6522 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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