MALICIOUS
86
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
This PDF sample was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript which is used to encrypt the document's content, hiding the payload from static analysis. The presence of PDF_JAVASCRIPT and PDF_ENCRYPTED_WITH_JS heuristics indicates that the JavaScript is likely responsible for decrypting and executing a malicious payload. The exact nature of the payload cannot be determined due to obfuscation, but the overall pattern suggests a downloader or dropper.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 3
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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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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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