MALICIOUS
66
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1027 Obfuscated Files or Information
The ML classifier strongly indicates maliciousness, supported by heuristic firings related to XFA forms and encoded PDF filters (ASCIIHexDecode, ASCII85Decode), which are commonly used for obfuscation and exploit delivery. The presence of these filters suggests the PDF is designed to hide malicious content and exploit vulnerabilities.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 3
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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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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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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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