Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8149552c6717f4c…

MALICIOUS

PDF

14.4 KB
MD5: 895d210173bd6c5c2015fc33b4c55acc SHA-1: b8d7702346dab009e8e86312ca0e77ac06c75fc0 SHA-256: b8149552c6717f4c4aceb5439054c23192e13a582ece8e9ed76558ce07ddeb65
168 Risk Score

Malware Insights

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

The sample is a PDF file that leverages XFA (XML Forms Architecture) to deliver a payload. Heuristics indicate exploitation of CVE-2010-0188, a vulnerability in Adobe Reader's LibTIFF component when processing XFA forms. The ClamAV detection 'Js.Exploit.HTML-30' suggests the XFA form likely contains embedded JavaScript or a similar scripting language designed to trigger the exploit. The embedded URL is likely related to the XFA schema and not directly malicious, but the exploit itself is the primary attack vector.

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: Js.Exploit.HTML-30 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.HTML-30
  • 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/