MALICIOUS
166
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1566.001 Spearphishing Attachment
The PDF contains obfuscated JavaScript, flagged by multiple heuristics and ClamAV, indicating malicious intent. The JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial compromise via spearphishing attachments. The obfuscation and lack of specific indicators prevent definitive family attribution.
Machine Learning
- Nyx PDF Classifier malicious score 0.9953
Heuristics 4
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Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECTA PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTIONClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0011_000.jsca838ab153ea9de4fff1e74bdd0848fd720f71bc6fbee4425be234136cd19b41 |
pdf-javascript-stream | PDF /JS object 11 at offset 0x1349 | 2325 bytes |
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