MALICIOUS
88
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream was obfuscated and utilized an unescape() call, indicating an attempt to hide its malicious functionality. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of an extracted JavaScript file.
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.js3a0af0896a1332cca34b3b27bb0c306f56b21605049f1ed9d10beadcf4f48367 |
pdf-javascript-stream | PDF /JS object 7 at offset 0x233 | 46689 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 238 eval/decoder/string-building token(s).
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