Malicious PDF — malware analysis report

Static analysis result for SHA-256 152aec5ae1621a76…

MALICIOUS

PDF

197.8 KB
MD5: 00b275a5bee90731a917db32108d9942 SHA-1: afae5b92b4b748d9161823c8ef6c53f92de9748c SHA-256: 152aec5ae1621a7696f3d12891c567ac2b19024bc8bddc9930e0b013638ae28c
136 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 streams that are indicative of exploit code, specifically targeting XFA forms. The JavaScript is designed to download and execute a second-stage payload, which is a common technique for malware delivery. The ML classifier strongly suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
5d4509f276f24f4bb21cf512309bf86720a108224f1c7e6cbb657c3b6641ec3e		 pdf-javascript-stream PDF /JS object 12 at offset 0x30431 3975 bytes
javascript_obj0012_001.js
545947c53afc8ea5df0295bb7eec71355b829fd72913258622c738b103e3877c		 pdf-javascript-stream PDF /JS object 12 at offset 0x30453 4862 bytes

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