MALICIOUS
166
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1566.001 Spearphishing Attachment
The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_OBFUSCATED_NAME_OBJECT and PDF_JAVASCRIPT. The embedded JavaScript is likely designed to download and execute a malicious payload, a common technique for initial compromise via spearphishing attachments. The ML classifier strongly supports the malicious nature of this file.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 4
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Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECTA PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTIONClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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