PDF malware analysis — malicious · c42b4a4c6d04a515

MALICIOUS

PDF

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

MD5: d5febcfb7613eb4985374650e17b6dd9 SHA-1: fe1a3676cff100d0111571cb6213359a83a5de20 SHA-256: c42b4a4c6d04a515c7c0b42366e46eac249710c9c157986aa1f8ee8ad3f0cd8d

136 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 revealed embedded JavaScript within the PDF, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely responsible for exploiting a vulnerability to download and execute a secondary payload, a common tactic for this type of threat.

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` `3ab2918e06556ea99a3200651a51877cf812857a7ef2c894be088bbb7e495d78`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74731 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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