Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64247a4a3bf6396…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-11
MD5: c8e9d0ed68f63f33f27aae77b06ccf91 SHA-1: 0c497a94f802bb1ff9a8d709148a6af78a158f8d SHA-256: a64247a4a3bf63961aa40d4dbb7e67e376d02c8a971b9630e18457bdc65ec5d9
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 JavaScript stream is obfuscated, as suggested by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' in the static triage. The presence of obfuscated JavaScript in a PDF commonly indicates an attempt to exploit a browser or PDF reader vulnerability or to download and execute a second-stage payload. No specific family could be identified due to the obfuscation.

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
    function ToNative(arg){return unescape(arg.replace(/Zb7FaY4eDp/g,'%u'));}
  • 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 595 bytes
SHA-256: 0933420bb7136c4ebec48e96e851489e52fcf190549fe885c129de838944dc06
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: b0f13af067bc90f2f6fbf764928619c4cddc9f60fe102e69fc040e63d777898b

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