PDF malware analysis — malicious · dfc63a0df9efc4b8

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: ee5391d2d7187ed8de4f7d3a89fa3c28 SHA-1: 8b5b7be9b731470170e7e86de386508ea02058a5 SHA-256: dfc63a0df9efc4b888a69a6ea7fdbcb93e97d99560f2be155205fa4f6c7810eb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection (Win.Trojan.Agent-36166) and an ML classifier. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, suggests an attempt to execute malicious code. While the exact script functionality is not detailed, such embedded scripts in PDFs commonly serve to download and execute further stages of malware or exploit vulnerabilities. The SHA256 hash is included as a primary indicator.

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` `0ae2e8ab033f05d77c8fb8368baef67b260d4ae6dd89fd10f7475dc6163b5ad6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74622 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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