Si la mention INFECTED n'apparait pas, a priori il n'y a pas lieu de s'inquiéter.
cf.
http://www.chkrootkit.org/
7. Output Messages
------------------
The following messages are printed by chkrootkit (except with the -x
and -q command options) during its tests:
"INFECTED": the test has identified a command probably modified by
a known rootkit;
"not infected": the test didn't find any known rootkit signature.
"not tested": the test was not performed -- this could happen in
the following situations:
a) the test is OS specific;
b) the test depends on an external program that is not available;
c) some specific command line options are given. (e.g. -r ).
"not found": the command to be tested is not available;
"Vulnerable but disabled": the command is infected but not in use.
(not running or commented in inetd.conf)