PDF malware analysis — malicious · 727f30f36a12bd9b

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: 3fb1e109d49667210eea73e060941cc4 SHA-1: 2b0a83b8c4a60f5b4970816d48d0b0b6c01a0a9a SHA-256: 727f30f36a12bd9b44a0073a3130280001168c32f5f128386a4b0288e1d9c291

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, flagged by multiple heuristics, and ClamAV detection indicates it is a known trojan. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a secondary payload, a common technique for initial execution and further compromise. The presence of JavaScript and the nature of the ClamAV detection strongly suggest exploitation for client execution.

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` `74ced537a6d81aa242b938b40cbf8c3763c9ffbacc7571c9a037ede27ff2d4ed`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74793 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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