MALICIOUS
206
Risk Score
Malware Insights
MITRE ATT&CK
T1059.007 JavaScript
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF JavaScript exploit. The embedded JavaScript attempts to decode a string from the PDF's title property and then execute it. This behavior strongly suggests the script is designed to download and execute a secondary payload, a common technique for malware delivery.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
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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ClamAV: Pdf.Exploit.Agent-36121 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-36121
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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.
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0007_000.jsd3b0f00a46f734fe742ab98b5da7d2c8eb1ec6fc899ad41b0cb5ba1dfef34250 |
pdf-javascript-stream | PDF /JS object 7 at offset 0x9C2 | 486 bytes |
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