PDF malware analysis — malicious · 7f798ef47a1bc9c8

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: 39e1214722a0cf1f7549441116f7e1f5 SHA-1: 1f5d3179b5076d14e9d168ec8051fdacd2c5c7c3 SHA-256: 7f798ef47a1bc9c8a81badb93733fc9bf51e4551360376659aca732366424539

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The embedded JavaScript, though heavily obfuscated, is designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams strongly suggests exploitation for client execution, likely delivered via spearphishing.

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` `b75e1d3b8cdee5ccae1ff39decac9917895e9f9819dd75fce22d36f90199fe69`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74819 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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