MALICIOUS
88
Risk Score
Malware Insights
MITRE ATT&CK
T1566.002 Spearphishing Attachment
T1059.001 Command and Scripting Interpreter: PowerShell
The PDF file is heavily obfuscated and encrypted, with heuristics indicating the presence of embedded JavaScript. The 'PDF_IMAGE_ONLY_LURE' heuristic suggests the document is designed to trick the user into clicking on something, likely to trigger the hidden JavaScript. The JavaScript is likely responsible for downloading and executing a second-stage payload, but its exact functionality is obscured by the encryption and obfuscation.
Heuristics 4
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Encrypted PDF carries /js — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/js). 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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Unusually high stream count medium PDF_MANY_STREAMSPDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
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PDF paints image(s) but contains no text operators medium PDF_IMAGE_ONLY_LUREPDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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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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