Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d455e309497885e…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-11
MD5: c6e729229526f3af960bc885d9ba6503 SHA-1: 361ebe1f7fa5781ea46b41eeb2d9cd6a2c908672 SHA-256: 1d455e309497885eacfb137e408ddc121965bbbc353c689df3a833ffab9e823e
150 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 unescape() call within the JavaScript stream suggests obfuscation and potential malicious intent, likely to download and execute a second-stage payload. While no specific family is identified, the techniques used point to a common PDF-based exploit delivery method.

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
    RandomVar1=unescape(RandomVar1);
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000325.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 676 bytes
SHA-256: 7d0244de1c321e107ece026f8e85933b7a809750ac0b7aa8836617e09b2e0e19
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
stream_003_off000005c5.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5C5 441 bytes
SHA-256: 52826e8d83674288ecaddc34b87407870973eb07bd989717789fbb0308277ce3

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