Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8bf3f0c2e85556…

MALICIOUS

PDF

29.8 KB
MD5: 38062f2a06630b6ee9f2b09476e1c9a5 SHA-1: e76c270d223c6822fa0c9586db06e338973b5d5f SHA-256: 8a8bf3f0c2e855569a4fd7622b6354a12b85ef2a622796d8c13fb07d31ccf6e6
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1559.002 Component Object Model Hijacking T1204.002 Malicious File

The PDF file contains embedded JavaScript and a Flash object (SWF), both of which are commonly used to deliver malicious content. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream and the SWF file are the primary indicators of the attack vector, likely leading to further exploitation or payload delivery.

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 0x8DD 53991 bytes
javascript_obj0006_000.js
7e82b42f40f8219de87df8ba5496c2acd9f220ef00041007caceea6e04b88651		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11528 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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