PDF malware analysis — malicious · 158676e0a77102f6

MALICIOUS

PDF

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

MD5: 44503f5e9efc48e88ff5f82521c63bc1 SHA-1: 2c0ceba64fc40a99008cbdbf93ce4b7651dc71fb SHA-256: 158676e0a77102f6356a95b92ee23be204bcfad5ecad12536fccf332f3ad8aa4

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. Embedded JavaScript was extracted, which is likely responsible for downloading and executing a secondary payload. The PDF structure and the presence of JavaScript strongly suggest it was delivered as a spearphishing attachment, exploiting a client execution vulnerability.

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` `9806f3637a6bef07f44f50c3b7dd97fb073f51cfe922c1a9ec79a40d467463d3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	76601 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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