Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5ef8e7c4034fea…

MALICIOUS

PDF

6.2 KB
MD5: b711aad4f34962d69e22e067bc2a45f5 SHA-1: cba3db1407686020465ca405ef079bb7980f2d99 SHA-256: 0b5ef8e7c4034feac99a62de15922c2f954c77bc13e17dadff46de6dba0ef27e
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 is flagged as an exploit. The JavaScript stream is obfuscated using unescape(), indicating an attempt to hide malicious code. The primary function of the script is likely to exploit a client-side vulnerability for code execution, and it is delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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_0023_00.bin
a73826665d557d7b77a424a12c0532f34b5fd1b1d1d489fe6e0c02f6ec3271c8		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 643 bytes

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