PDF malware analysis — malicious · 6f03bce3b7fe8f89

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: bd1f9b0a3c6151c42692b948934fe3e9 SHA-1: 08e108ca87cbade5f07bfbb1c300a7a3cbcc7a08 SHA-256: 6f03bce3b7fe8f89975f538059fc0e4920f5468a9c3c7027d0e8c59c212a4230

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, identified by heuristics and ClamAV detection as malicious (Win.Trojan.Agent-36166). The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload. The ML classifier also strongly indicates maliciousness. Given the nature of the findings, it is highly probable that this PDF was delivered as a spearphishing attachment.

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` `06a345d00d837b6b354a1ebe1d1f343672dfc57d5d339f17934ac82c0a4d7367`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75178 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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