MALICIOUS
66
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The PDF file exhibits multiple heuristic indicators of maliciousness, including the use of XFA forms and encoded filters (ASCIIHexDecode, ASCII85Decode) often employed in exploit delivery. The ML classifier strongly flags this PDF as malicious. While no specific document body text or scripts were extracted for direct analysis of user-facing lures or payload execution, the combination of exploit-related heuristics and the high ML score suggests the primary purpose is likely to exploit a client-side vulnerability.
Machine Learning
- Nyx PDF Classifier malicious score 0.9991
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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