Malicious PDF — malware analysis report

Static analysis result for SHA-256 98859f41b856d34e…

MALICIOUS

PDF

21.5 KB
MD5: b27b1254fde2e82b2512e4b421876a39 SHA-1: 85af664f4c931b998ba29c88102c1749fdda2ecf SHA-256: 98859f41b856d34e2408287530718bb146068d07a6dacc5beae2d4a291150a26
168 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1190 Exploit Public-Facing Application

The sample is a PDF file that leverages XFA forms to exploit CVE-2010-0188 in Adobe Reader. This exploit is designed to download and execute a secondary payload. The embedded URL, while seemingly benign, is part of the exploit chain. The ClamAV detection 'Pdf.Exploit.Dropped-78' 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.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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/

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