PDF malware analysis — malicious · 84163981857403ba

MALICIOUS

PDF

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

MD5: 48940521bcc07564db3c17f2519acdeb SHA-1: 0d351bd46831894654a84baf739ab085fbcda561 SHA-256: 84163981857403ba9859d20a88c29591cc25a5f7543d9fc9394e25ed2b3e309c

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. This suggests the PDF is likely a spearphishing attachment designed to exploit a client vulnerability and download a secondary payload.

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` `55bf2fe19e702106921fb281aa27c61d96af7c889bfd9324d6294f5221e50058`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83937 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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