Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc1684ac15de53d…

MALICIOUS

PDF

6.5 KB First seen: 2026-05-10
MD5: 3b8630b26b66dea530057c392afdf501 SHA-1: 4848ccc53924d05e4d2688616bc9e7774697aea1 SHA-256: 4dc1684ac15de53d54b62e331e8476cdd1d075d44915125829167cebf1ad1c72
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 heuristic and the 'Script obfuscation indicators' signal. The unescape() function is commonly used to deobfuscate malicious JavaScript. While no specific malicious URLs or scripts were directly extracted, the presence of obfuscated JavaScript points to a likely attempt to execute arbitrary code or exploit a vulnerability within the PDF reader. The benign URLs present are standard RDF and Adobe namespace declarations and do not indicate malicious activity.

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

Related samples 1

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_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).
stream_003_off000005c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5C6 450 bytes
SHA-256: d0c80cf6763b8037ecc06a026c9e745deb2eb593b4adff711f8db790bbd36da1

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