Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0a3fb597671df1…

MALICIOUS

PDF

6.1 KB
MD5: d2fb9335f0ff2bd514deaaeb916c0794 SHA-1: efb87a9eaec84073fb8d138aba9d3b273ac761e7 SHA-256: 6a0a3fb597671df18a2d8ff16f936840ebfd47a133ac5ca2479c118abecae636
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes an eval() call, a common technique for obfuscating malicious code. This JavaScript is likely designed to exploit a vulnerability within the PDF reader to execute arbitrary code, potentially downloading and running a second-stage payload. No specific family could be identified due to the generic nature of the exploit.

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.
  • 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_0023_00.bin
a41f65ebc43e8362771954fba803751d58ec9d8e14ec27e0d58eef97d667ff38		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 481 bytes

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