Malicious PDF — malware analysis report

Static analysis result for SHA-256 42021b4e8b6a2ad2…

MALICIOUS

PDF

28.5 KB
MD5: 1c44a15a7b9ce6b2deb483bbae38662d SHA-1: 05763ec143de1ab61daf27e1dcb7daf5695583eb SHA-256: 42021b4e8b6a2ad28a1be752a5885bde769824de0bb4f26fe4dd896ce8c3dee3
168 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

The sample is a PDF file that leverages XFA (XML Forms Architecture) to exploit CVE-2010-0188 in Adobe Reader. The XFA form contains a numeric evaluation stager that is decoded from a raw stream, indicating it's designed to execute a secondary payload. The embedded URL, while benign in appearance, is part of the XFA template structure and not directly indicative of a malicious destination in this context.

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.
  • ClamAV: Pdf.Exploit.Agent-36825 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36825
  • XFA numeric character-table eval stager high PDF_XFA_NUMERIC_EVAL_STAGER
    PDF XFA initialize script reads numeric form data from rawValue, maps the values through a short character table, and evals the reconstructed stage. This is an exploit-kit staging technique even when the final decoded layer remains encoded.
  • 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://www.xfa.org/schema/xfa-template/2.5/