Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c94d42a3ecdcdd…

MALICIOUS

PDF

6.9 KB First seen: 2026-05-10
MD5: 135e9079251aee7c7db3dc2747dcd954 SHA-1: 27d7066fb32d2437d94532aee3ac0a81ded8cf50 SHA-256: b3c94d42a3ecdcdde6f0703366552be1e870460baa86cf0a0794417e1a258b98
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests that the JavaScript is obfuscated, likely to hide its malicious intent. While no specific malicious URLs or payloads were extracted, the presence of obfuscated JavaScript points towards an attempt to execute arbitrary code, potentially for downloading further malware or exploiting vulnerabilities. The benign URLs present are standard for PDF metadata and do not indicate malicious activity.

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(/d6H4n3Q1F9v5/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_off00000714.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x714 718 bytes
SHA-256: 815837f4e4a061704dc3ae9bc8062373598f41442934411e7efcf411de76d9ca

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