Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e73412527f2fc86…

MALICIOUS

PDF

29.8 KB
MD5: 9f9d49f226e3b5830f135ed31f356f56 SHA-1: 14655907cc73a76004ca69de270b903e068f3e23 SHA-256: 3e73412527f2fc86db8d9e99b63cd8eb2433c421c01d6a26ba9a08c3287c1a7e
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content. The ML classifier strongly flags it as malicious. The presence of a JavaScript stream and an embedded SWF file suggests an attempt to execute arbitrary code or exploit vulnerabilities within the PDF reader or associated plugins. The extracted JavaScript file and SWF file are flagged as suspicious artifacts.

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 0x8CD 53991 bytes
javascript_obj0006_000.js
ffe80e3b78438042d9b70b8a09047cc2d9669b13c5a3c14916817ce8ba81c037		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11498 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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