Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390ee921fd07c18…

MALICIOUS

PDF

6.2 KB First seen: 2026-05-11
MD5: 9846b9c3c0f6492fdc3a03a28e2622ef SHA-1: bc8859683bf2cb268d2f09287010de0b01a68238 SHA-256: d390ee921fd07c181202a8eddb50d7daddc2a3590eaa0e55dc42100943d8369f
198 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple PDF-specific heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE. The JavaScript stream, identified as stream_002_off00000323.js, likely contains obfuscated code designed to execute malicious actions. While the exact payload is not immediately clear due to obfuscation, the presence of these indicators strongly suggests an attempt to exploit the PDF viewer or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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
    /*isn4Ged434GWFg <LRT8DFGQvfdQ> P45nuiSFQZXGh*/eval(/*isn4Ged434GWFg <LRT8DFGQvfdQ> P45nuiSFQZXGh*/unescape(/*isn4Ged434GWFg <LRT8DFGQvfdQ> P45nuiSFQZXGh*/this.subject.replace(/Y/g,String.fromCharCode(37)).replace(/R/g,'F')/*isn4Ged434GWFg <LRT8DFGQvfdQ> P45nuiSFQZXGh*/)/*isn4Ged434GWFg <LRT8DFGQvfdQ> P45nuiSFQZXGh*/);
  • 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)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000323.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x323 320 bytes
SHA-256: 45ed5ab241de7ef2a7649d4a5832e3b6714f533438a73ac8e38f245e53f8e6fa
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: 7eab7033733b2ae707b46efd6e90793cd8b8edd93b16de198494454811e257ef

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