Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0892e3eeaf8d29…

MALICIOUS

PDF

7.0 KB First seen: 2026-05-10
MD5: 708a391762bab186249eca99bb3a3ef1 SHA-1: ab5ffffe198d05905c6dd57a2645ae44c28bca1e SHA-256: ef0892e3eeaf8d299bf560b5334ead12906b03e2e5b19d5780c743e05163b9ca
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The JavaScript stream is obfuscated, as suggested by 'PDF_UNESCAPE' and 'EXTRACTED_FILE_STATIC_TRIAGE' which noted 'Script obfuscation indicators'. The presence of obfuscated JavaScript strongly suggests an attempt to execute malicious code, likely for downloading further payloads or exploiting vulnerabilities. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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 RandomVar8(RandomVar9){return unescape(RandomVar9.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_003_off0000040a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40A 2093 bytes
SHA-256: 6f11522a798ee624a43e9be11b214148f0685e62ad63e83951ae938bf8566a4b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_004_off000007ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7CE 485 bytes
SHA-256: 890ab37267f35688889d654f88245b4d20f6819915d8c0359045389c4eb9fd88

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