Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff4d1605a2ea316…

MALICIOUS

PDF

45.5 KB
MD5: 18fb885320fcc74afc126a18ca5dba20 SHA-1: 5796dea04d1ca2a2b68bb33e8f60b18487c99e23 SHA-256: 5ff4d1605a2ea3169e3d5a03285965056425801ce8807c653d00d7ad8ed1c919
176 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, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_XFA. The JavaScript is heavily obfuscated but appears to be designed to exploit a vulnerability within PDF viewers, likely leading to the execution of a second-stage payload. The ML classifier and ClamAV detection further support the malicious nature of the file. The benign URLs extracted are likely decoys or unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9595

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.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
50304d300dc358822825a7c20aedd938683c8c2c865062e000b85b7dbd0b89b6		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E3 3946 bytes

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