PDF malware analysis — malicious · 65e3b3a7fb97d60f

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: e4d3906e9c9fc9e71871f627748a2c77 SHA-1: 7f0e8c0fffd53985d9878d6434b6b511efdaeac3 SHA-256: 65e3b3a7fb97d60f6a983b3d9c8234e08089086b0caaca93611ba904989b9494

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a malicious PDF containing embedded JavaScript, as indicated by multiple heuristics and ClamAV detection. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection of 'Win.Trojan.Agent-36166' strongly suggests 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` `577110262d59f08ed764c4f791712a5cfeda462bfd1212245d6a0a5b627b4d3c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75120 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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