Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3500f328fdb2055…

MALICIOUS

PDF

8.3 KB
MD5: 5db5cf72143de1b2187fff11a3d66615 SHA-1: e698f322e72ea28f58914bd4e1ba111997da56fd SHA-256: a3500f328fdb2055c7adf2a2d7c6deda85fe7171d85cfa20266ed3afadea9428
66 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The script, found in stream_004_off00000b78.js, uses eval() and String.fromCharCode, suggesting obfuscation and dynamic code execution. This pattern is commonly used to download and execute a second-stage payload. No specific malware family could be identified.

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low 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)
  • 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)
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000004ab.bin
8505f10ea09728a0b8061e075f08305459e5e3c53453a51cfcdb1922310e1722		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB 2438 bytes
stream_004_off00000b78.js
72976bee7b057c9d715415314d451ee25a9862b4b3f68da1b805b85fdca17bf5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB78 366 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0026_00.bin
a2f8de3621f58330da4a7da86ea1d6eac3410178550140f5ef4fcd4ca55acc66		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 418 bytes

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