Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b9de8ec5d83b7…

MALICIOUS

PDF

6.3 KB First seen: 2026-05-09
MD5: 01fc5bbd3bdaa650c87eafe144abd94b SHA-1: a5deefd499ee3821eec75f9d2e7ad30e7a340733 SHA-256: cf9b9de8ec5d83b78af456e62baa82f7390187f8f816c4f781731f44f5bda599
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call within the JavaScript stream (PDF_EVAL) suggests that the script is likely obfuscated and designed to execute arbitrary code, potentially downloading and running a second-stage payload. No specific malware family could be identified, and the benign nature of the extracted URLs means the primary threat vector is the embedded script.

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: 39063b8d6e5430ae7807d0b8d209c96a3ee3a550f79378ba2451dfc10d36d508

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