Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ca30adc072f026…

MALICIOUS

PDF

6.3 KB
MD5: 1d9b6d26cc6e55c3d4efeddc761030b6 SHA-1: c0256f6e6e8cd489e85148d4a1ae276fbd43994b SHA-256: 67ca30adc072f026b8e622f1bf70e5fe976b583175780d8f21335aa63171483c
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that is executed using an eval() call, a common technique for exploiting PDF vulnerabilities. The ML classifier strongly indicates maliciousness. No specific malware family could be identified, and no external URLs were found to be malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.

FilenameKindSourceSize
objstm_0024_00.bin
29a0ca5be4134f63f5644d5fe754abf176795809ec7d88a0fac14331714e0b30		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 385 bytes

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