PDF malware analysis — malicious · b8b03668e967269a

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: 78b9c0ef0b5e9b71d46de692388e97b3 SHA-1: 861bff613469769c22dbe0ea6e1c247b7a12bd2a SHA-256: b8b03668e967269ad106581ee34177bb57fc99a9c10abf1becd590fb1b4dc06f

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36166, indicating a known malicious signature. Heuristics also identified embedded JavaScript, suggesting the document's primary purpose is to execute malicious code. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for this type of malware.

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` `58fa980b2e58249593b7208abe9d4d45b25c8f638b6ebb132945bed28143921a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74579 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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