PDF malware analysis — malicious · 71b478decc83088b

MALICIOUS

PDF

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

MD5: 1e52b6844331d5e2fc842dc016dd0809 SHA-1: b4cf0b8c233e0512c652814dc525c2432ba5363e SHA-256: 71b478decc83088bb4720495d3c44cad448dc84d53e59c52c74ea79d2909da47

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, flagged by multiple heuristics and a machine learning classifier, indicating malicious intent. ClamAV detection confirms this, identifying it as Win.Trojan.Agent-36166. The JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for malware distribution.

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` `6d99a9d99e17537c7b73c3e814ee3e5fbdec750d1da97d6a41d48ae0917106eb`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75228 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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