PDF malware analysis — malicious · 5463649fa2729cab

MALICIOUS

PDF

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

MD5: 327233f186e5dd9e00199ef85e085ad6 SHA-1: 14b080f00ce7fa1507ad32392888b4635d4c21f6 SHA-256: 5463649fa2729cab56f6017aa0879485e76f5007cf5d920e161e4e3b3df3d6b4

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript stream, named 'javascript_obj0013_001.js', is obfuscated and likely responsible for downloading and executing a second-stage payload. The 'PDF_UNESCAPE' heuristic further supports the presence of obfuscated script 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` `bddb73e524fe5a390400c947df05ef8ade26872640e9966183c9a55c13e9d9f5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x366	3086 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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