PDF malware analysis — malicious · 75042758a5c0a63e

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: 3e01e45586875df0c139ae4bf8f15e1d SHA-1: 2e5bde6f8bf38d26671b4f6625f0ac787b157659 SHA-256: 75042758a5c0a63e5c89e5a7ea61e305c99b5ae19f338b4102ae0c863f42734d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The embedded JavaScript, although obfuscated, is designed to download and execute a second-stage payload, as indicated by the ClamAV detection of 'Win.Trojan.Agent-36166' on an extracted artifact. The primary attack pattern is likely a spearphishing attachment leading to client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 4

ClamAV: Pdf.Dropper.Agent-7273373-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7273373-0
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` `5b049bdaf2c3b3465c05ec8ac637573bd819e7cf5c2b411ebb10413d9731b880`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	74911 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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