Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6c6f22cfb10e3c…

MALICIOUS

PDF

29.8 KB
MD5: af0fef1abc251846d8473cf2157b7b3b SHA-1: bb47ea1468a91ed8020e4f7e9c78ee1ae5c41e91 SHA-256: 3a6c6f22cfb10e3cc0a309b50f3f69316147f57ccf5fda9c59359c507f4566b8
112 Risk Score

Malware Insights

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

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and a Flash object. The ML classifier strongly flags this PDF as malicious. The presence of JavaScript and a Flash object suggests an attempt to exploit vulnerabilities or execute arbitrary code. The extracted artifacts, 'javascript_obj0006_000.js' and 'test.swf', are likely components of the attack.

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
80ff3eda7537f56cca44e8407e7c1965b2bfe64e49d4b8ed0044e63b8c28d882		 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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