Malicious PDF — malware analysis report

Static analysis result for SHA-256 0304325c93bbedd2…

MALICIOUS

PDF

6.2 KB
MD5: 6018b4f587f0c01b2309fe939c46d1ec SHA-1: 8abf43223044ea8398341aedd513aa3d9139d6b2 SHA-256: 0304325c93bbedd26330a0e5f823b24d00dc6053174ddc528a3a4da3a85f7ea6
148 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is triggered by an action. The presence of PDF_JS_EXPLOIT_CLUSTER and PDF_EVAL heuristics indicates that the JavaScript likely attempts to exploit a vulnerability within the PDF reader to execute arbitrary code. The ML classifier also strongly suggests maliciousness. No specific family could be identified, and no external URLs were found to be malicious.

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
0cd355ddea46df77fd5decc87bb579762c6cfe3792e8e2724590c52053ddc4e1		 pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 638 bytes

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