MALICIOUS
164
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/JScript
T1566.003 Phishing: Spearphishing Attachment
The PDF contains embedded JavaScript and is flagged as encrypted with JavaScript, indicating a hidden malicious payload. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of JavaScript actions and embedded JS streams points to an exploit attempt, likely for downloading further malware. The 'Pdf.Exploit.Agent-30129' signature further confirms its malicious nature.
Machine Learning
- Nyx PDF Classifier malicious score 0.9769
Heuristics 7
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ClamAV: Pdf.Exploit.Agent-30129 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-30129
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Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/JavaScript). 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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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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XFA form low PDF_XFAPDF uses XML Forms Architecture — can contain script logic
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PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LUREPDF has 1 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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