Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51411b3381b97ce…

MALICIOUS

PDF

6.1 KB First seen: 2026-05-10
MD5: 279e1313e7d1b67d52a88a572fbd78a4 SHA-1: 41692705862a47db9a8ba5f48ce612a9a9d02835 SHA-256: c51411b3381b97ceca8876c94d0fca16e134d5f57a3636e019a8a8d758484bef
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. A high-severity PDF_EVAL heuristic firing suggests the script uses eval() to execute code. While no specific URLs were found to be malicious, the embedded JavaScript stream (objstm_0023_00.bin) is highly suspicious and likely used to download and execute a second-stage payload. The document body is unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 564 bytes
SHA-256: ef3eaad6d8b262fa6ed407ceb8e16804495ff4e500d1c7d2717a82ce0b1c0986

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