Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51393b9e0c5dd1c…

MALICIOUS

PDF

7.0 KB First seen: 2026-05-10
MD5: 3c65886cf40e144d0e801d0f8314d4ce SHA-1: 422881d83e60fa9e4306c7ffe50efb2e7ef7ab60 SHA-256: b51393b9e0c5dd1cd67377ec8a8d99d58f8c43e564ce4db7061a7e407ed80cee
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 evidenced by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' static triage finding. This obfuscated script is likely designed to download and execute a second-stage payload or exploit a vulnerability within the PDF reader. No specific family could be identified due to the obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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_off00000327.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2302 bytes
SHA-256: 61978f9daf4e7cb3a3a0c7a44a132eed374542ffe90968eb378dced01a90f85b
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off0000080f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x80F 442 bytes
SHA-256: 55d4908e365660861a09da0e0527d147a0e6fd198196a7baf685947cf9d3c18d

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