PDF malware analysis — malicious · 4865a8761b93e5d1

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: 03ef6e479b5ccdd5a4e41ebcf8318f80 SHA-1: b15243482184a67536c77d3b27625b9f2f4777fc SHA-256: 4865a8761b93e5d1481b17c6f31f11192412b7b73e3266a73bcf1f8e4e53e25a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections for 'Pdf.Exploit.Agent-15517' and an extracted artifact 'Win.Trojan.Agent-36166' strongly suggest exploitation. The ML classifier also flagged this as highly malicious. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Exploit.Agent-15517 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-15517
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` `5e34bf2caa9f612a38d57d9d655a4134eef43ef14735c30153076bdf91c1a81b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75126 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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