Malicious PDF — malware analysis report

Static analysis result for SHA-256 5113582d2fe45ab5…

MALICIOUS

PDF

29.8 KB
MD5: fa4ab115ca7baab175dd99a7f6a96586 SHA-1: ba6d35c6aa13d04344d0695e333e6ff62af96e87 SHA-256: 5113582d2fe45ab54fcd3cd5372907bd0d08bc6dbe7df4071ab335d104e1ea11
112 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, both of which are commonly used to deliver malicious payloads. The ML classifier strongly indicates maliciousness. The embedded JavaScript file 'javascript_obj0006_000.js' and the Flash object 'test.swf' are the primary indicators of compromise. The presence of these elements suggests an attempt to exploit vulnerabilities or execute arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 0x8DA 53991 bytes
javascript_obj0006_000.js
24126d4a6f0d46c63d586ed9bd19bbc7964db9533f0264190420b33778d0973e		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11522 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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