ClamAV 0.91 is the first release to enable the anti-phishing technology
in default builds. This technology combines heuristics with special
signatures and provides effective protection against phishing threats.
Other important changes and add-ons in this version include:

    - unpacker for NSIS (Nullsoft Scriptable Install System) self-extracting
    - unpacker for ASPack 2.12
    - new implementation of the Aho-Corasick pattern matcher providing
      better detection for wildcard enabled signatures
    - support for nibble matching and floating offsets
    - improved handling of .mdb files (fixes long startup times)
    - extraction of PE files embedded into other executables
    - better handling of PE & UPX
    - removed dependency on libcurl (improves stability)
    - IPv6 support in clamav-milter
    - many other improvements and bugfixes

The ClamAV team (http://www.clamav.net/team)