MALICIOUS
108
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1204.002 Malicious File
T1055 Process Injection
The PDF file contains an OpenAction trigger at offset 0x707, indicating it's designed to execute code upon opening. Additional heuristics suggest the use of XFA forms and ASCIIHexDecode filters, common in PDF exploits. The ML classifier strongly flags this as malicious. While no specific document body content or scripts were extracted for direct analysis of user-facing lures, the presence of exploit-related triggers points to a likely attack pattern involving the exploitation of PDF reader vulnerabilities.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 5
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OpenAction trigger high PDF_OPENACTIONPDF has an /OpenAction that launches, submits, or opens an external target
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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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PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILEDThe cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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