PDF malware analysis — malicious · 0fa8aaf04f536647

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: dfedac6da9e9e153c362ae2e93cf1ee4 SHA-1: 1565e720b2c047a012b2cec33adc964ea1e4d949 SHA-256: 0fa8aaf04f5366479df0cffd7723d31cc9c7a8e7827a2b9b9384904423bda3df

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection (Win.Trojan.Agent-36166). Embedded JavaScript was detected, which is commonly used to download and execute further malicious content. The presence of JavaScript actions and embedded JS streams strongly suggests this script is responsible for the malicious behavior, likely downloading 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` `40efea064332473d45366b6f60a98e8937899de800c55ba9dbbb3be7e2a11928`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75636 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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