PDF malware analysis — malicious · 4a1b9cae651a2109

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: 44d2d412223a33f5574ea9197b6bcc03 SHA-1: 85eb4d3ee3eebea1e811cfa267cac54cd2060551 SHA-256: 4a1b9cae651a210927bc249ffa879af87df19a3cef6532c39c8ff76c62c3caa6

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36166. Static analysis revealed embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of JavaScript within a PDF commonly signifies an attempt to execute malicious code, such as exploiting a browser or PDF reader vulnerability, or downloading a secondary payload. The exact nature of the JavaScript could not be fully determined due to potential obfuscation, but its presence is a strong indicator of malicious intent.

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` `22d1c696f3ee877497af45ceb6807a34c18fd4ac45407d9dc83f8219692d6187`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74630 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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