Malicious PDF — malware analysis report

Static analysis result for SHA-256 087eb941f7572baf…

MALICIOUS

PDF

78.8 KB
MD5: 8b33af7d4d3fdd2478ae8ac4b683a597 SHA-1: 521660e5013190b0ec1b442fc9aa32865ffccb86 SHA-256: 087eb941f7572baf315c678dbf8d6dc701bc4aa60f174bf59a0a6443d7419e2d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier and heuristics. It exploits CVE-2010-0188, a known vulnerability in Adobe Reader related to XFA forms, to execute a payload. The embedded script payload and the nature of the exploit suggest it's designed to deliver a secondary stage. The SHA256 hash is included as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • 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 script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
ca002050ad4992204920cafd4a3ba27157c31343cf12e2063bc220539c55b9d8		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 79897 bytes

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