MALICIOUS
84
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/JScript
T1553.005 Subversion: Mark-of-the-Web Bypass
The PDF document was flagged as malicious due to the presence of JavaScript actions and an embedded JS stream. It is encrypted and uses an OpenAction, which is a common technique to obscure malicious content from static analysis. The PDF also contains AcroForm buttons with action triggers and is designed to appear as an image-only lure, further suggesting an attempt to deceive the user. The combination of these factors indicates a likely attempt to download and execute a second-stage payload.
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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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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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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AcroForm button with action trigger low PDF_ACROFORM_BUTTONPDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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