Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dbc198744cac71…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-10
MD5: 7ac97d518906f06e5ca245c99bfb890a SHA-1: e5d7db44dba845ac5b39c79bd5436b0d919808f9 SHA-256: f4dbc198744cac71d84eefee0e38778e9b0788457340eca5430f4ffb47b5bdae
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 signal. While no specific malicious actions are directly observable due to obfuscation, the presence of such scripts in PDFs commonly indicates an attempt to exploit vulnerabilities or download further malicious content. The benign URLs present do not contribute to the maliciousness assessment.

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
    return unescape(RandomVar12);
  • 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_off00000325.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 795 bytes
SHA-256: d1ef670e9c914e0ecc6312e25eb9537d501528274c933146c4be2adc79fb7e38
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: 207e300549acf4608fc9c917f04f935af6c07a96476e4da719043e4027104400

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