MALICIOUS
90
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
The PDF file was flagged as malicious by an ML classifier and contained obfuscated JavaScript. The JavaScript stream, named 'javascript_obj0007_000.js', was further obfuscated using unescape() calls, indicating an attempt to hide malicious code. The primary function of this script appears to be downloading and executing a secondary payload, which is a common technique for initial access and further system compromise. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.
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.js2a5d1f2bd4af679762275147d1e59a373fa31e1a3288e97deff729930117e4ea |
pdf-javascript-stream | PDF /JS object 7 at offset 0x233 | 46942 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 255 eval/decoder/string-building token(s).
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