PDF malware analysis — malicious · d31d44ef533c066c

MALICIOUS

PDF

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

MD5: decb52007ded5b98469e7e5c3581b73e SHA-1: 40c8537457425af57d1827f1d733a7c88665b42d SHA-256: d31d44ef533c066cfafc30c7bddb933f9b28899d3fb77190984c67b27e3538cb

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment

The file is a PDF with embedded JavaScript, flagged by heuristics as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript, named 'javascript_obj0007_000.js', is the primary indicator of malicious activity, likely serving as a downloader for further stages. The PDF structure and metadata do not provide specific clues beyond its nature as a container for the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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` `289b4a1c692f589a19aac4dfebc8e29f865a3fade389c9e8a7a0117bfb27995a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A5	75210 bytes
Detection ClamAV: Win.Trojan.Agent-36166 Obfuscation or payload: unlikely

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