Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bff9a7eb8265f21…

MALICIOUS

PDF

14.3 KB
MD5: 4fa6b48e7013d6f5c82c2547cfa1e66b SHA-1: c82c638d0493df14c59f1b60e266d1012dc2c9c8 SHA-256: 8bff9a7eb8265f218758d03e7aa394b867f9972e7a4c9aedacdbf0d3ef824352
168 Risk Score

Malware Insights

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

The sample is a PDF document that utilizes XFA forms, triggering heuristics related to XFA exploits. Specifically, the CVE-2010-0188 exploit is detected, indicating the file attempts to leverage this vulnerability in Adobe Reader. The presence of an embedded URL and ClamAV detection as 'Js.Exploit.HTML-30' further supports its malicious nature. The primary attack vector appears to be user interaction with a specially crafted PDF.

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/