Malicious PDF — malware analysis report

Static analysis result for SHA-256 f731279394f65c1d…

MALICIOUS

PDF

6.9 KB First seen: 2026-05-11
MD5: d5357d291b8e26e41249596f61066382 SHA-1: 3569fa926ef875b73fa9820ee735304ce21f367d SHA-256: f731279394f65c1de5236e62a9435bbf050d0c01bad4876b20b4259101a3a042
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call (PDF_EVAL) suggests that the script is likely obfuscated and intended to execute arbitrary code. While no specific malicious URLs were extracted, the embedded JavaScript itself is a strong indicator of malicious intent, potentially to download and execute a second-stage payload. The benign URLs found are standard PDF metadata namespaces and do not indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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
    eval(a);
  • 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_0027_00.bin pdf-objstm-decoded PDF /ObjStm 27 0 obj (inflated) 526 bytes
SHA-256: 759b915a91a6bf4ec965315fa1b8f6226e037a6d334d3d02215befa776c019c4

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