PDF malware analysis — malicious · 7a64c5d4b14f5874

MALICIOUS

PDF

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

MD5: 9e736f9c8294da11c8c7e1edac1fa362 SHA-1: 23ba9008edabd55c6ace8b8a6e195872afeb8c1e SHA-256: 7a64c5d4b14f58740588ccf61b36750f9409a229d9ab6e2ffca7998258f2173c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as Win.Trojan.Agent-36166. Embedded JavaScript, obfuscated within the document, is likely responsible for downloading and executing a secondary payload. The presence of JavaScript actions and streams strongly suggests this attack vector.

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` `77a3396d1a106a277e5b1ed01c560bcd95a41a93c98e036581cbc9e2f67b1f4e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74409 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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