PDF malware analysis — malicious · 679af37f97b3562d

MALICIOUS

PDF

90.3 KB

MD5: 2f7f71bc7b9fc66d0df51d6a30e1173e SHA-1: 8bde6d2496c533bfc3d330f4965ba6337e992aed SHA-256: 679af37f97b3562d2424506d4f575defcdbe062eb6e4100ba3559b87fda60d60

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that constructs a URL and attempts to execute a payload. The script dynamically builds the URL 'https://oscigtru.com' by concatenating various string fragments. This behavior, combined with the ML classifier and ClamAV detection, strongly indicates a malicious downloader. The primary technique observed is the use of JavaScript to fetch and run a secondary payload, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Agent-36169
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_obj0008_000.js` `9a0cc9ca05f9f8c68f9c96f4db3e9f6a01a4bd92d32785bfafc72b9117a66bed`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1903 bytes
Detection ClamAV: Win.Trojan.Agent-36169 Obfuscation or payload: unlikely

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