MALICIOUS
114
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1204.002 Malicious File
The PDF contains embedded JavaScript and is encrypted with JavaScript, indicating an attempt to hide malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of PDF_JAVASCRIPT, PDF_JS, and PDF_FILTER_HEX heuristics further supports the execution of obfuscated JavaScript. The encrypted nature suggests the JavaScript is responsible for decrypting and executing the actual payload, likely a downloader.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 5
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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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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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