Malicious PDF — malware analysis report

Static analysis result for SHA-256 619de6ba0f295ab8…

MALICIOUS

PDF

6.3 KB
MD5: 5e7bfc7f8a6576ff3e4f55963e271057 SHA-1: 45db5f3553349ea0e439bb36614106c9bcf77949 SHA-256: 619de6ba0f295ab8617af924f4f861c8e5e47e4e895c662a7e00607adeccfe9c
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 utilizes an eval() call, a common technique for obfuscating malicious code. This JavaScript is likely responsible for exploiting a client-side vulnerability to execute arbitrary code. The presence of the PDF JavaScript exploit cluster heuristic and the high ML score indicate a malicious intent, likely to download and execute a secondary payload.

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_0025_00.bin
926bf339c747f517b4b94a5c18f28fb61e4f6b85d5670db5cf3e7ff3d81f48a6		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 527 bytes

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