Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bca879708315007…

MALICIOUS

PDF

29.8 KB
MD5: 68eff4af663a20e832b8e14b24c0ed07 SHA-1: f746cad65f31d2e118b85aaf46f9c7ac73670042 SHA-256: 3bca879708315007f3a33faf0d31dde074010724d25ab4b2d6302afd34ab9990
82 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1559.002 Component Object Model Hijacking

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The embedded artifact 'test.swf' and the extracted JavaScript file 'javascript_obj0006_000.js' are suspicious. The JavaScript stream uses String.fromCharCode, suggesting obfuscation. The presence of these embedded objects points towards an attempt to execute malicious code or exploit vulnerabilities within the PDF viewer.

Heuristics 8

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
test.swf
4d4d42d908c48737d0cbe1f33c14f197803950e6ff47f9c0f13e1d51a231494d		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x8DE 53991 bytes
javascript_obj0006_000.js
81ccfae39e24b42624d0d4c63d97c22de8b8c65500e65ca35816e3d90dba374f		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11534 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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