PDF malware analysis — malicious · 84887c60f04e761d

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: 9b5c907ec9c60403375d4b09fe3b5594 SHA-1: 5951f6aeba3e79561c979edfe9708e4f2a4e078e SHA-256: 84887c60f04e761d6a798ea9f788fb4556ae782546bc3c75946cc3b6e9588e66

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by heuristics and ClamAV, which is a common technique for delivering malware. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated and truncated, but its presence strongly suggests it's responsible for downloading and executing a secondary payload, aligning with the typical behavior of a malicious document.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36166
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b6e1192726b7e63047b442e31d0a2a10bb5e48cdb97b547a6c340531ead91f68`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75153 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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