MALICIOUS
134
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
T1140 Deobfuscate/Decode Files or Information
The PDF contains embedded JavaScript and utilizes obfuscated filters (ASCIIHexDecode, ASCII85Decode) which are commonly used to hide malicious code. A machine learning classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage payload. The specific attack pattern involves leveraging PDF vulnerabilities to execute arbitrary code.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 5
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ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTIONClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEXHex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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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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ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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