It looks like a common Joomla hacker recon/probe/attack trying to exploit that Joomla plugin if it exists. This is probably a completely random probe/recon/attack. You can ignore the Security log entry. If you want to know what a lot of blocked hacking, spamming, bad bots, other deviant stuff is then around 500,000 blocked hacking, spamming, bad bots, other deviant stuff per month logged in the BPS Security Log would be considered a lot. I believe this forum site gets around 500,000 blocked deviant things logged per month.
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