Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d94a1b0b52d98d…

MALICIOUS

PDF

111.0 KB
MD5: 9ca9d3293dfe2bf77d739653b275c9bc SHA-1: 731ca4405f3d14b8dfccb19546a80811cbbf1b68 SHA-256: 21d94a1b0b52d98dd7c83df4f59fc158c930e044c01bf3fd585a109a1e48c631
248 Risk Score

Malware Insights

The PDF file contains an XFA form with an embedded script, which is exploited by CVE-2010-0188 in Adobe Reader. This exploit likely downloads and executes a second-stage payload, as indicated by the ClamAV detection of 'Js.Exploit.HTML-27' on an extracted artifact. The document body content is highly obfuscated and does not provide clear user-facing text.

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
bfc60abb6b5ad184a96a9d56db94437e20c646324a01c3a53dda37e8c7bb7c2c		 pdf-embedded-script PDF raw stream script payload at offset 0x238 112899 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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