Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51e79aca674bb37…

MALICIOUS

PDF

6.6 KB First seen: 2026-05-10
MD5: 723a83854e5851b2a20a1b2e1e42bf5f SHA-1: 228952c03be2453f5ba3300d1ecb38ef8003e475 SHA-256: d51e79aca674bb374e08a01901037a1856b1a785d2fde515b0698f99940177ba
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_UNESCAPE suggests the script may be obfuscated to hide malicious activity. While no specific URLs were found to be malicious, the embedded JavaScript stream itself is a primary indicator of a potential attack, likely aimed at exploiting a PDF reader vulnerability or downloading a secondary payload. The document body is unreadable, providing no further context.

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(/Zb7FaY4eDp/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
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 466 bytes
SHA-256: 7af53593e0e08088d0352dd2103ed1e668599b18859507c81de9bf1447beb209

Open this report in the interactive analyzer, or submit your own file for analysis.