PDF malware analysis — malicious · 1323022c4150a7a0

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: 0ba17844e04b450f594747417f1a44fd SHA-1: 6c46d1afe3af316711d2532edfb6d211ff6179fc SHA-256: 1323022c4150a7a058b96f0f8cad3cc142715e7865d597399d8994cce2da1112

166 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as 'Win.Trojan.Agent-36166'. The embedded JavaScript, although obfuscated, is designed to execute code, likely to download and run a second-stage payload. The presence of JavaScript actions and embedded JS streams strongly suggests an exploitation attempt.

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` `94c03a1db8c0a5dda8445100cd2d8b8c337a1861ddfc4fb96119e6c5f9f378d4`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75162 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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