Malicious PDF — malware analysis report

Static analysis result for SHA-256 242f5e791d8e2632…

MALICIOUS

PDF

28.6 KB
MD5: c6b2cc6a5f42ec21230e9baa360d6db7 SHA-1: bea7323eb2fce785d830ab59da05896cd05f5b17 SHA-256: 242f5e791d8e26323ff9f272538f64bb0ed9081515486cca65f07a5ded9f9dff
168 Risk Score

Malware Insights

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

The sample is a PDF document that leverages XFA forms to exploit CVE-2010-0188 in Adobe Reader. The heuristic firings indicate the presence of an XFA form and a numeric evaluation stager, which are commonly used to deliver exploits. The embedded URL, while seemingly benign, is part of the XFA structure and likely used in the exploitation chain. The ClamAV detection further confirms its malicious nature.

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/