Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99cd9d777134c07…

MALICIOUS

PDF

111.4 KB
MD5: 1560e3d5b13fae0feab733b2db743318 SHA-1: 355c348822035c326a4c979317d33ef3857c87a3 SHA-256: c99cd9d777134c07e6d41e2496a916eed51a6fcf5b4aeae57ddb39e1d828e523
248 Risk Score

Malware Insights

The sample is a PDF document that leverages the CVE-2010-0188 vulnerability in Adobe Reader's XFA forms to execute a payload. The embedded script payload, detected by ClamAV as Pdf.Exploit.Agent-6136306-0 and its extracted artifact as Js.Exploit.HTML-27, indicates the document's primary purpose is to exploit this vulnerability. The document body content is heavily obfuscated and does not provide clear user-facing text, but the presence of XFA forms and the specific exploit points to a malicious intent to compromise the user's system.

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
31db4790989d1b78cf0d9ed6bfcf83e39130cc2c72e3714b38761506c291a41c		 pdf-embedded-script PDF raw stream script payload at offset 0x238 113389 bytes
Detection
ClamAV: Js.Exploit.HTML-27
Obfuscation or payload: unlikely

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