PDF malware analysis — malicious · 19b34327a1627167

MALICIOUS

PDF

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

MD5: e80c8b7ce5274f6c6da20039d2282c12 SHA-1: 62b6600ce598fe917ae3402facfc1080be5f8c98 SHA-256: 19b34327a1627167de74d4a6312ce4d7d8bcc09dcb65f111d6ef0f5ff1d8e013

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

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 heavily obfuscated but appears to be responsible for downloading and executing a second-stage payload, a common technique for malware delivery.

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` `b58921842c38f63d273abbfcf21368a23d35e4ae3ad33ff70d34ebbfeef61d0e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74390 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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