Malicious PDF — malware analysis report

Static analysis result for SHA-256 507af66b0d382475…

MALICIOUS

PDF

7.1 KB First seen: 2026-05-10
MD5: 6a4a32e537feb1cf46c9ccd57859369b SHA-1: 72ba334ec8e5eab3462f9853a6e0457d44f840e2 SHA-256: 507af66b0d3824759bb0ff59369403badf158afd1f4b05cf5d82aa0a28819383
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 and uses an unescape() call, suggesting an attempt to hide malicious code. While no specific malicious URLs or scripts were directly extracted, the presence of obfuscated JavaScript is a strong indicator of malicious intent, likely to download and execute a second-stage payload or exploit a vulnerability. The benign URLs present do not detract from this assessment.

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 2324 bytes
SHA-256: 393ca565434fb175307e09e51887c2a9a219630f5ea17c7793dba504f3e1a833
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_off0000082a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x82A 442 bytes
SHA-256: cddb7038474e60622efd40d54f7ca28fa6c83471acd4f8106c5ce3132a146322

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