PDF malware analysis — malicious · 8bb0efce4cf77490

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: dfbcf1ff38b52af03c76930c8c3025a2 SHA-1: 6bd6be814060b7c5add4552b64560a1f3041f889 SHA-256: 8bb0efce4cf7749002d2394667c055196d6d76b675dc5b6d7e66ba73b393de2b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as Win.Trojan.Agent-36166. The embedded JavaScript file, javascript_obj0007_000.js, is the primary artifact likely responsible for the malicious behavior, potentially downloading and executing a second-stage 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` `4b9d1b9bdc014c8d7bc3a7f4aee0f85daeb2f3d67a6fdbc125a1f2951288dc64`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74943 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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