MALICIOUS
148
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript
T1204.002 Malicious JavaScript
This PDF file contains embedded JavaScript that utilizes an eval() function, a common technique for executing obfuscated or dynamically generated code. The heuristics indicate a PDF JavaScript exploit cluster, strongly suggesting the script is designed to download and execute a secondary malicious payload. The ML classifier also flagged this PDF as highly malicious.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 5
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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eval() call high PDF_EVALeval() found — commonly used for obfuscated exploit execution
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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_obj0013_000.js7cf87a44c58a33c992de119212e920e26f526496360e81a5b5015cc5a94b9a3b |
pdf-javascript-stream | PDF /JS object 13 at offset 0x336 | 23690 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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