I would like to know if SpamAssassin uses the following blacklists:
rhsbl.ahbl.org dnsbl.ahbl.org
And I would also like to know under what conditions they are enabled (i.e. by default, etc.)
No they are not used by default, and there's no built-in rule for them. They also aren't backlists I've heard of before. However, someone can reconfigure SA to use pretty much any blacklist.
$ cd Mail-SpamAssassin-2.60/rules/ $ grep -i ahbl * $
ahbl.org does have a set of SA rules on their website to make it easy for anyone to add it to SA. Those only query dnsbl.ahbl.org
http://ahbl.org/using/spamassassin.txt
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