Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a3962856281ff4…

MALICIOUS

PDF

8.2 KB
MD5: f05cd9f3275c25a516a0a0775c3c3a7a SHA-1: 549686095e8c03dd3ae9951c76a345714721d50a SHA-256: 93a3962856281ff4acb0300238e8ecfde03b34d1a24836de234334b63573214f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/Shell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call (PDF_EVAL) and String.fromCharCode (PDF_FROMCHARCODE) suggests obfuscated code execution. The ML classifier also flagged this PDF as malicious. While no specific URLs or file hashes were extracted, the techniques used point to a downloader or exploit loader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

Heuristics 5

  • 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)
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000049a.bin
8505f10ea09728a0b8061e075f08305459e5e3c53453a51cfcdb1922310e1722		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A 2438 bytes
objstm_0025_00.bin
9414ef62530cec6f5f2eee39ef5a003cfd580687c0cebf48e85f7ae4bc9df4fb		 pdf-objstm-decoded PDF /ObjStm 25 0 obj (inflated) 546 bytes

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