PDF malware analysis — malicious · 1423709a7c924820

MALICIOUS

PDF

6.1 KB

MD5: ff0444f858522adbe59927e9bcd7d609 SHA-1: 410a7ead6a16e19397e618c184c06fe7759d8a23 SHA-256: 1423709a7c9248200ca440c90997011003e9101713b985fce322216e7a6b9ac6

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is executed via an eval() call, indicating an attempt to exploit a client-side vulnerability. The ML classifier strongly suggests maliciousness. While the JavaScript itself is obfuscated, the presence of exploit cluster heuristics and the ML score point to a malicious PDF designed to execute arbitrary code upon opening. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9761

Heuristics 5

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF 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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objstm_0023_00.bin` `98489ea09eaf2779bee16463dafb6440433ec437b711d87c5c25a66c6773444d`	pdf-objstm-decoded	PDF /ObjStm 23 0 obj (inflated)	553 bytes

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