MALICIOUS
94
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
This PDF was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is likely used to obfuscate and deliver a malicious payload, as indicated by the 'PDF_ENCRYPTED_WITH_JS' heuristic. The presence of JavaScript actions and streams within an encrypted PDF strongly suggests an attempt to bypass static analysis and execute harmful code.
Machine Learning
- Nyx PDF Classifier malicious score 0.9997
Heuristics 4
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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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Optional Content Group with action trigger low PDF_OPTIONAL_CONTENTOptional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0009_000.js1c21b037ca00ef80150c55b989e30a32c0540c7b350c5414d6e850cb16b31c0e |
pdf-javascript-stream | PDF /JS object 9 at offset 0x3D7 | 32974 bytes |
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