PDF malware analysis — malicious · 5b8af7a1dce7882d

MALICIOUS

PDF

69.6 KB

MD5: e82e313bf9b4726abca8b8cea07db32a SHA-1: 9a0c2f0aed96c25d8a9ef32127ca280ded26729e SHA-256: 5b8af7a1dce7882d1cc41b63dd9311ffcc9176343b7004043576fb9b27d699ec

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by heuristics and the 'PDF_JAVASCRIPT' and 'PDF_JS' firings. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is heavily obfuscated but likely serves to download and execute a secondary payload, as is common for this type of attack. The single embedded URL, while currently unknown reputation, is included as a potential indicator.

Machine Learning

Nyx PDF Classifier malicious score 0.9811

Heuristics 4

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.bitstream.com

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `05edf057f885f2901e576d026c86b1a87decbb5db9eb8b22bf434ac446ba2cad`	pdf-javascript-stream	PDF /JS object 12 at offset 0x10600	3563 bytes

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