PDF malware analysis — malicious · 55d3631db368d615

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: f888b7b795bfb65a49e9d5da053d8f11 SHA-1: 5ffacbd038231536b07713eac5e363c875d132e3 SHA-256: 55d3631db368d6159361adf656da9f01359241ddb3f2e1cc7edc0da58e792c0c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristic analysis and a machine learning classifier strongly indicate malicious intent. ClamAV detection of 'Win.Trojan.Agent-36166' further confirms the malicious nature of the file, suggesting it acts as a trojan downloader or agent.

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` `973fc1d5962d05431635ea84574da1d7f366d709b4ff4ebe70a5fbaea1a1c7a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74596 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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