Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91fc6fc39ead2b7…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-11
MD5: 93a9108288f99dd8db70fd763494efe5 SHA-1: a1c190c65794d9fbdc0b690eaed66590ab7e355e SHA-256: b91fc6fc39ead2b70c83b4fd68aeb096d61c7521fe7f7e8224ea217a78c5c2a9
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The JavaScript stream, located at offset 0x550, is likely intended to perform malicious actions such as downloading a second-stage payload or exploiting a vulnerability. However, the JavaScript content is heavily obfuscated and truncated, preventing a more detailed analysis of its specific intent or the reconstruction of any URLs or commands. The benign URLs extracted are not indicative of 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(/ARG/g,'%u'));}var RandomVar2 = RandomVar8('ARG9090ARG9090');
  • 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_off00000550.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x550 617 bytes
SHA-256: 2fc29d7de6631656b69b84edc3d5a90ba09efa5b51eefec25098b19a6080cc9d

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