PDF malware analysis — malicious · 74cae92898411f43

MALICIOUS

PDF

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

MD5: 44a3e9a5df4f90736b725e4ae1194f53 SHA-1: e3931bbf507d29f34301918ac693f9f48e7cb6ff SHA-256: 74cae92898411f435725d8078d14c4fce9da29f2cea4d5f4326388e8c7f15f02

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics and a machine learning classifier. ClamAV identifies the sample as Win.Trojan.Agent-36166, indicating it's a known malicious agent. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload, a common technique for this type of malware.

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` `f4d50e322ca0f6be1409da3e8dee2c2303af4d120dd9218021417e7c4e0050fa`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75895 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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