Malicious PDF — malware analysis report

Static analysis result for SHA-256 b675b8cc1910541c…

MALICIOUS

PDF

111.0 KB
MD5: 33ffbd1078aa5f165944de7ff8fb71c8 SHA-1: 4bfdd238b5b8b92234203e05523f3191b5501161 SHA-256: b675b8cc1910541c37c8b1c80bd069a402487c95e1d6f38396128b74cab48a49
248 Risk Score

Malware Insights

The PDF file contains an XFA form with embedded script, which is a known vector for exploiting vulnerabilities like CVE-2010-0188 in Adobe Reader. The ClamAV detection 'Pdf.Exploit.Agent-6136306-0' and the detection on an extracted artifact 'Js.Exploit.HTML-27' further confirm its malicious nature. The embedded script likely downloads and executes a second-stage payload, although the exact script content is not fully detailed in the provided evidence.

Heuristics 7

  • 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.
  • XFA form contains executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose dataset contains a <script> or <xfa:script> block — XFA scripting has been the exploit primitive for several Adobe Reader RCEs (CVE-2010-0188 family, CVE-2018-4901, and others). Plain XFA without scripts is far less risky.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • 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_pdf_script_00000238.bin
cd9e5d5cb5c9d934d68d91b01e04b0b37c0b4f8d9466b1444a6d8ed14aed8cac		 pdf-embedded-script PDF raw stream script payload at offset 0x238 112901 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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