Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cda3f817f5e58e…

MALICIOUS

PDF

45.0 KB
MD5: a5ff41e4b1d0b1c690b49321cde96beb SHA-1: c22bd21068e7f7ac236b98e913095ae297615452 SHA-256: 65cda3f817f5e58e4dce85e2cb93e3e4d2dab41411077b09b5fa348a46be0aaa
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, flagged by multiple heuristics as malicious and part of an exploit cluster. The JavaScript is heavily obfuscated, but its presence and the exploit cluster signal indicate it's designed to execute arbitrary code. This is a common technique for delivering further malware stages. The benign URLs extracted are likely unrelated to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9740

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
1cbbc92add789eebc8044dcc9c08885d394a0d6e2f525a48d3cc378b16d1222f		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1E2 3479 bytes

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