Malicious PDF — malware analysis report

Static analysis result for SHA-256 364ae64c66e4804e…

MALICIOUS

PDF

6.2 KB First seen: 2026-05-10
MD5: 39d044fcc7cb176a7a93824467503fbf SHA-1: 846cfdcf304ae6b27b08d1610e5905fe00eda369 SHA-256: 364ae64c66e4804e104473ff5afaa5efc76404d5a1855ae89467529a890c9fb8
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 a PDF_EVAL heuristic firing suggests that the JavaScript is likely being used to execute arbitrary code, potentially to download and run a second-stage payload. No specific URLs or file hashes were extracted, and the document body was unreadable, limiting further analysis of the exact intent.

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
    eval('/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/jubtbsb/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/=/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/eval;/*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/'); /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/
  • 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_off00000322.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x322 313 bytes
SHA-256: cf9fc247eb2f3ca482c11a3334fecb6683591a3e0b287792d44701b4754b985d
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: afc3c7b58be3104f689e253c632765fc9d1d7542c463b0a860c4e0aa7833ddfd

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