PDF malware analysis — malicious · 0bbc656fe141a6e3

MALICIOUS

PDF

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

MD5: 696924e65662d8c657372938162c4300 SHA-1: 5eb24e683f8dadbaf71ff145b0b006836f8fefaf SHA-256: 0bbc656fe141a6e38c5f37de3be8a498ceb18cb7cb3ae09c108357920f1710f9

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166', and an ML classifier indicating high maliciousness. Embedded JavaScript was extracted, which is commonly used to download and execute further malicious content. The presence of JavaScript actions and streams strongly suggests this technique.

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` `88a314c91813f1efcf74bbb4a0df37a12372f8c999e933c91472d5f926f8a0d0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74764 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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