MALICIOUS
88
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is obfuscated, indicated by the PDF_UNESCAPE heuristic firing, and the ML_NYX_PDF_MALICIOUS rule. The primary function of the script appears to be downloading and executing a secondary payload, as suggested by the suspicious extracted artifact 'javascript_obj0007_000.js'. The exact nature of the payload cannot be determined due to obfuscation, but the overall intent is malicious.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 4
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unescape() call high PDF_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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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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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0007_000.js4487d4faed6431cb448d8a17329ca76d73cb3dc3c23598a28e6e37467b2df1be |
pdf-javascript-stream | PDF /JS object 7 at offset 0x233 | 46465 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 230 eval/decoder/string-building token(s).
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