MALICIOUS
106
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
This PDF file was flagged as malicious by an ML classifier and exhibits several high-severity heuristic firings. Specifically, it contains embedded JavaScript and is encrypted with an OpenAction, indicating an attempt to hide a malicious payload from static analysis. The presence of ASCIIHexDecode filters further suggests obfuscation techniques common in malicious documents. The JavaScript action is the primary mechanism for delivering the malicious payload, likely involving downloading and executing a second-stage component.
Machine Learning
- Nyx PDF Classifier malicious score 0.9970
Heuristics 4
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Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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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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