There's lot of speculation going around, but basically if a script is on the repository (aka you download it from the site, and not a thread on the forum) and you believe the bot itself is safe (which you seem to believe since you're just asking if a specific script is unsafe, not the bot) then you'll be fine, since all scripts on the repository are checked by the developers.
i mean this is a community full of cheaters and the people who gain the most are normally the dirtiest people. I dont have accounts being constantly banned because i sit on sythe and try to make friends with the honorable people of sythe.