PDF malware analysis — malicious · bf925008f2994811

MALICIOUS

PDF

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

MD5: f0dea8ef8105e364f4327daa10541a91 SHA-1: 7ca32d6d52958f3b21c956d2c45568338ab11202 SHA-256: bf925008f29948114b97ca7161d05f92ce5aa3492c73bea4dad645a4de8c61d3

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis detected embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities to deliver further malicious payloads. The ML classifier also strongly indicated maliciousness. The exact function of the JavaScript is not fully discernible due to its size and potential obfuscation, but its presence alongside the ClamAV detection strongly suggests it's used to download and execute 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` `aab79c6b4988baf2641bf489aad3f20dfba269464e87171096d7aabe660bdb4e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74575 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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