Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1393a78713e4dc…

MALICIOUS

PDF

897.3 KB
MD5: b8a92dbeb86e18d108cfd5fb78b51ec8 SHA-1: 67eb259a09a0546ffe9ceb23bc4f71559a29db66 SHA-256: ab1393a78713e4dc553e7bbf3fcb409d47cb96f1b1b6d2492dcd44f8f5a138ee
102 Risk Score

Malware Insights

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

The PDF contains embedded Flash content (Tatsumaki.swf) and a JavaScript stream, both flagged as potentially malicious by heuristics and an ML classifier. The presence of these embedded objects suggests an attempt to exploit vulnerabilities or execute arbitrary code. The ML classifier's high confidence score further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/xfa/promoted-desc/
    • 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
Tatsumaki.swf
93d4dfc19b02f2382f3de8207a9fea88c65503900c685c29eeed5c068b813d24		 pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x2602 4057 bytes
javascript_obj0006_000.js
583c24beeda0d6c6eed71a7ee93f0cd81846e0526733395049973b01f98bfc9c		 pdf-javascript-stream PDF /JS object 6 at offset 0xFC 8669 bytes

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