Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb0574610e2a74f…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 323908d2a5cc67c22a5dc65b235171f1 SHA-1: d4bd17b8b49d1bde64941937f96fb4554e6b4061 SHA-256: 4fb0574610e2a74f1d7a270b41022f782cecf09e272d647db8460df06c824a2a
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within this JavaScript (PDF_EVAL) suggests that the script is designed to execute arbitrary code, likely to download and execute a second-stage payload. No specific family could be identified, and no malicious URLs were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • JavaScript action low 2 related findings 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)
  • 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.
    Matched line in script
    eval(itkuy8);
  • 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# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 385 bytes
SHA-256: 9cacc83fc07e3d2030ca0677efdc25a485c542108257e99cf4f524121799a434

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