PDF malware analysis — malicious · 672270eaddbf72ae

MALICIOUS

PDF

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

MD5: be4ba39b5279bfb46a20133d03e52bef SHA-1: 4175fa45a68084edb3ac0504fcb8d2f7c73f8d43 SHA-256: 672270eaddbf72aeeb19f535f6fb2bfd0cd610f12b92844cc3fecb9c3a1d3c95

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The embedded JavaScript, although obfuscated, is designed to download and execute a secondary payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36166' on an extracted artifact. The presence of JavaScript actions and embedded JS streams points to T1059.007 (JavaScript) as the primary execution technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7268282-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7268282-0
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` `498c94cb8a5ac6e50e4beed96f9c5317535a6957d6216173454dd85ccb36f5be`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74635 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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