MALICIOUS
116
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF was flagged as malicious due to the presence of JavaScript, which is used to encrypt the document and hide its payload. A secondary embedded PDF was also found with similar suspicious static findings. The combination of PDF encryption with JavaScript and embedded malicious content suggests the file is designed to evade static analysis and deliver a malicious payload.
Heuristics 4
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Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGEA valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
polyglot_child_pdf_off0000f259.pdf7ef2b60154b097bccbaebec18fb73cae621e40edf1209e3b4339d7ebc2fba8b0 |
polyglot-child-pdf | Secondary PDF body inside pdf container at offset 0xF259 | 9451 bytes |
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