Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d78c5a31b0d344b…

MALICIOUS

PDF

6.5 KB First seen: 2026-05-11
MD5: ccd01c574ccc9ea565207b4b8777f6ab SHA-1: aed8e1812b03fc3564ca3ffc65c8bbf5f4451fb9 SHA-256: 9d78c5a31b0d344b5868c9ffc76e9899621092ba9dd68f1b0e7ac050487c05b6
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 firing and the 'Script obfuscation indicators' static triage finding. The primary purpose appears to be exploiting PDF vulnerabilities to execute malicious code. No specific malware family could be confidently 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
    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_003_off0000041f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41F 284 bytes
SHA-256: 86c7c9a71bede3822097ecb5e74e158f671c4983d9223a810ab7717834a834cf
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
objstm_0025_00.bin pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 375 bytes
SHA-256: a8c09ee2de14ca29130e3aaf7083217e10b33c14bafaa5eb2604c3e862b6b327

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