Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb95bd25bd76c2d9…

MALICIOUS

PDF

29.8 KB
MD5: 9cccbf44d24b901b14fda531bfc2b84f SHA-1: 36999b7eb52bf3c2407a1821a5ea77e1e6423f37 SHA-256: cb95bd25bd76c2d9bd604ab7103359dd574d0d9308e62ca3190c6c238c7cb93c
112 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and Flash content. The ML classifier strongly suggests maliciousness. The presence of a JavaScript stream and embedded SWF file points towards an attempt to execute arbitrary code or exploit vulnerabilities within the user's system. The specific JavaScript content, though obfuscated, likely facilitates the download and execution of a secondary payload.

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 0x8EE 53991 bytes
javascript_obj0006_000.js
2e17869d7ef8187727a96cce06c526641a12678101093d2096d635711240ad9c		 pdf-javascript-stream PDF /JS object 6 at offset 0x106 11582 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 239 eval/decoder/string-building token(s).

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