PDF malware analysis — malicious · cf8c2f2ffabc865e

MALICIOUS

PDF

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

MD5: bc5811760e81afbccee60ac0c5706ab8 SHA-1: 428a49beb5ea783ec1975b1a5092865e15a57de7 SHA-256: cf8c2f2ffabc865e7c4715b7f8bf26ae8b790aba197ec87b57cdcde22309fb50

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF document flagged by multiple heuristics and ClamAV as malicious, specifically as a dropper. The presence of embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics, strongly suggests that the script is designed to download and execute a secondary payload. The ML classifier output of 0.999917 further supports the malicious nature of the file. The extracted artifact also triggered ClamAV with a Trojan signature.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7306327-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7306327-0
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` `f3954b2e3e969a005307091d37173e5f5c403f4092d35d0b72ac822a18f00a1a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74801 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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