Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27ebf320c4d15ab…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 07f8ad1ddf1365f6b55794ef8680eccf SHA-1: 5516d585b8990c021cf5b184a1235d2bd0e40832 SHA-256: f27ebf320c4d15ab7d325743fc60ad1fe8011b6dc54dc64261daedb5edb699cd
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains an embedded JavaScript stream which is obfuscated using unescape(). The JavaScript is likely intended to download and execute a second-stage payload. While no specific family is identified, the presence of obfuscated JavaScript points to a downloader or droppper type of malware. The benign URLs found do not detract from the suspicious nature of 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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) 459 bytes
SHA-256: 5eb9b52fecbab157e0733e4ab322015a8924ffce0f496fa34d332d76fb697178

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