Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9328973b7d5b6a…

MALICIOUS

PDF

7.0 KB First seen: 2026-05-10
MD5: 03e7b53673fc1c1b16305fa30bb39ba6 SHA-1: 969574d0f363cc5200e2127d902e0daa0aada244 SHA-256: 3d9328973b7d5b6a7ced6e9b1e067aacb128d99ddc41b4a02c04893d90395204
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an unescape() call within a decoded stream suggests code obfuscation and potential malicious execution. While no specific malicious URLs were extracted, the overall structure points to a delivery mechanism for further malicious activity. The document body content is unreadable, limiting further analysis of the lure.

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 2300 bytes
SHA-256: 8cedeca35c2c1854d54d6afa9e8a6d4d27c4962fac3220e0eceedb56ba2f1a99
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_off0000080c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x80C 442 bytes
SHA-256: cb0454d16989dd42572fa73ce4bef72876e1fcc71a2e46e066c03718c0bf04a7

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