MALICIOUS
66
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The PDF sample contains XFA form elements and uses ASCIIHexDecode filters with exploit indicators, suggesting an attempt to exploit a client-side vulnerability. The ML classifier strongly flags this PDF as malicious. While no specific exploit code or payload URLs were extracted, the presence of these elements indicates a likely exploit for client execution, often delivered via spearphishing.
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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AcroForm button with action trigger low PDF_ACROFORM_BUTTONPDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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