Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86d852585dc3e36…

MALICIOUS

PDF

121.6 KB
MD5: ffc947df0f53f195ac74e4a96a74d2f4 SHA-1: ce1cbe0bd9443dc362c03b0ecdaa18b5a7290619 SHA-256: c86d852585dc3e3684cd3e210d1bcfde137325baf23d3a493aef8aa6e6ec9f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is a PDF file identified as malicious by ClamAV (Pdf.Exploit.Dropped-78). Static analysis detected an embedded file and an XFA form, strongly indicating the use of CVE-2010-0188, an Adobe Reader LibTIFF XFA image exploit. This exploit allows for arbitrary code execution, likely to download and execute a second-stage payload. No scripts were extracted, but the exploit itself is the primary attack vector.

Heuristics 6

  • 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.
  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded script payload in PDF stream medium 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 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://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
0db646516fe697d757a907c76aae007c7d53b22dcaea5c8eb783e873935646c9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 123798 bytes

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