PDF malware analysis — malicious · d0783f0d855b37f6

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: fc3b4c90f542e9797c9a97a71af0b245 SHA-1: 33a1ebf43e3d1b91cd0ebd99a8aee0dcf794def1 SHA-256: d0783f0d855b37f6c5f1c0d8c4f0ae3f013ccb6c09915bd5bd9ab2d4108fb3f8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is a PDF file flagged as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript, indicating an attempt to execute code. The ML classifier also strongly suggests maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though its exact function is obscured.

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` `af8a52632fbac2795011b8a6561953e63ddae11045781007a9af6248f928e528`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74930 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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