Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcaa2b1530ed9acd…

MALICIOUS

PDF

8.2 KB First seen: 2026-05-10
MD5: 1dde043bf21f8aab8da233ea6ec2779d SHA-1: d54e7e7c2741540873c189a66474a91898425128 SHA-256: fcaa2b1530ed9acd3b69e2ab29f90612e9f52460f8d68a9f6f5d01b32265fd29
116 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

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
    }hvkoa6+=String.fromCharCode(fscoa[i]);}
  • 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_003_off000004a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4 2438 bytes
SHA-256: 8505f10ea09728a0b8061e075f08305459e5e3c53453a51cfcdb1922310e1722
objstm_0025_00.bin pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 533 bytes
SHA-256: f1c57ece4e4d1c17fe8dc49934b402bcc81ea7a0f21b85b68eb0d86b59900426

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