Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4f28e23c653414…

MALICIOUS

PDF

6.1 KB First seen: 2026-05-10
MD5: 83107d034bea8039f91829991123059d SHA-1: 4981832b4edac7c782f6f5de015508517660f551 SHA-256: 4e4f28e23c65341420950a2717a7e751d1b4279c81d88da8bf3d80c2e1c85686
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript with a high-severity eval() call, indicating a potential for malicious code execution. The JavaScript stream and an object stream were extracted. While no specific URLs were found to be malicious, the presence of eval() strongly suggests the script is designed to download and execute a second-stage payload. The techniques T1059.001 (PowerShell) and T1059.005 (Visual Basic) are relevant due to the use of scripting within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000167d.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x167D 167 bytes
SHA-256: dad6f63e8ec4ea6de70512378b4ac27e005f615b0a54caa38b6510a2e5f067fd
objstm_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 392 bytes
SHA-256: 8f0e1fa5761a48ee6b73a225e77b3ca2df180302c2908824caa9fe2b93b26a6b

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