PDF malware analysis — malicious · 05a98466eea7d9a2

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: ae812a9b94d1395fce219d9e9e11dec2 SHA-1: ea1c4fb0b64f3d4f68980a03362de189e0bd300d SHA-256: 05a98466eea7d9a27f3d111ba5f73599ad18e726a9068843ff6d3ea9b7b20e5d

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Win.Trojan.Agent-36166. The embedded JavaScript, though heavily obfuscated, is indicative of a downloader or exploit loader, likely attempting to retrieve and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to exploitation of PDF vulnerabilities.

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` `006ec6532a58e4a4cec45beb796b55ed3c442a7ad18a99da1d6cbdf98aeac499`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74174 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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