MALICIOUS
96
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The PDF file contains embedded JavaScript and is encrypted, with an OpenAction that likely triggers the script execution. This indicates an attempt to hide malicious content and bypass static analysis. The presence of PDF_ENCRYPTED_WITH_JS and PDF_JS heuristics strongly suggests the script is designed to download and execute a secondary payload. The PDF_FILTER_HEX heuristic further points to obfuscation techniques used to conceal the malicious content.
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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JBIG2Decode filter medium PDF_JBIG2JBIG2 image decoder present — historically used in zero-click exploits
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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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