Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a7743f20866d91…

MALICIOUS

PDF

8.0 KB First seen: 2026-05-10
MD5: 24a05d08bf5370c1d2c970190b3b4876 SHA-1: 869a844a0837e1c5b47ce3333e2dc9a8d77afb11 SHA-256: d5a7743f20866d91becfa7a0b6b50ac849b1d123f268d7c93d0175d0aee7d1e7
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream, identified as stream_003_off00000a3e.js, contains an eval() call, suggesting obfuscated code execution. This JavaScript is likely responsible for downloading and executing a second-stage payload. The benign URLs present do not contribute to the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9366

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
    /*fGhkjkDFhkhsfd <FDSJHFhkjkjSDFkj> FDKLFJHklfkldshfSLDf*/ 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000032d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D 2498 bytes
SHA-256: 5f2a5883485a31a0853b5a7fb713afeb51cfe2e78e6b29473ddc79d9ff30878f
stream_003_off00000a3e.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA3E 372 bytes
SHA-256: 2d0e1efdfa6110385aac29417e1a9d65e8e7ccab9271cd5a5863752fe736691a
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0025_00.bin pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 375 bytes
SHA-256: 4fa7dd730dbc082820bc499d97c892b9167b622b088b305b5fb85b76f5354c1a

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