Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf7c126d1a315c4…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 0f8f71bec81e706917680ddec9611e3f SHA-1: 19971dfacad394ed70781ebc5886943f6a1b595f SHA-256: 4bf7c126d1a315c415e7b9fb0da3cd811b81428a291d87a4cca36c6d3fa8d14d
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_UNESCAPE call suggests obfuscation or exploitation of JavaScript functions. While no malicious URLs were extracted, the embedded JavaScript stream is a primary indicator of malicious intent, likely to download and execute a second-stage payload. The file's purpose is inferred to be malicious execution via 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
    function RandomVar8(RandomVar9){return unescape(RandomVar9.replace(/ARG/g,'%u'));}
  • 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
stream_003_off0000056b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56B 569 bytes
SHA-256: 4fc0efb8c34c726f65fce4b6da4792e2450f900461f12813e1543ab6f2c76ef7

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