/usr/share/doc/libc-icap-mod-clamav/examples/libc-icap-mod-clamav.pattern-update is in libc-icap-mod-clamav 1:0.1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
#
# This Script reconfigures srv_clamav after Clamav Pattern update
# It gets installed as /etc/clamav/onupdateexecute.d/libc-icap-mod-clamav
#
/bin/echo -n "srv_clamav:dbreload" > /var/run/c-icap/c-icap.ctl
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