PDF malware analysis — malicious · ab9aa042efb9fea3

MALICIOUS

PDF

15.0 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)

MD5: d35f93d6716017879b792bffe518696d SHA-1: 81b9460b69931f72941e1ad83605df674bde8a0d SHA-256: ab9aa042efb9fea381828a49a6a6ee76b8c7c9a1569dace46ba993f66882c06b

168 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to download and execute further malicious code. The ML classifier also strongly indicated maliciousness. The exact behavior of the JavaScript is not fully detailed due to its size and potential obfuscation, but its presence and the ClamAV detection strongly suggest a downloader or agent trojan.

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` `c61fc6e4303f6a80d43855bc4784438ec7d7709f4d13d2299fdddaa4b183309b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	83617 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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