PDF malware analysis — malicious · 6cbba7975711054d

MALICIOUS

PDF

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

MD5: f54810b2184a2145bdf9ac24daac8de2 SHA-1: 3b2b19cbdeb7dfe0ad65aa841becc4f3db9d23d2 SHA-256: 6cbba7975711054d90b3b61822ab7355a9becdc48862383b467da0808a2f9a65

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 identifies it as Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated but is likely responsible for downloading and executing a secondary payload, a common technique for this type of malware. The ML classifier also strongly indicates maliciousness.

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` `762034f278119d1fb9710953220d1122b228a2c8bab2fe132d996c880a94cd51`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	76617 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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