What is helper-tool Unix Executable File

Delete it. Its appearance in Login Items is not normal.

If this is under the "Background Items" section, then ignore it. Something you installed is using this utility. Unfortunately when Apple showed the "Background Items" to users, Apple did a terrible job implementing the feature and did not provide proper details to developers on how program their apps properly so the correct information would show up here. Changing any setting in the "Background apps" section will just break one of your installed apps. Unfortunately there is no way of determining what app that item may belong. There are multiple threads about this issue on this forum and one of our respected contributors who happens to be a third party developer @etresoft has said this many many times. Here is one example.....See the post by @etresoft here:

Perpetual "Background Items Added" --- @etresoft's explanation - Apple Community

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I found this thread when searching. My "Helper-Tool" login file seems to be related to Java. Its location is:

/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Resources/Helper-Tool

There are tons of nondescript login items in that list. I wish there was a better mechanism to find more info about some of them, because only half of them have the "Show in Finder" button, and many of them are named after a developer I've never heard of, rather than the name of the app itself.

Applications which require execution of privileged operations need to install a helper tool which will show up in the Login Items section of System Settings. If done properly, the name of the developer would show with the helper tool. Some applications (for example those downloaded outside the app store and those not signed by developers) won't have a name associated, so it may be more tricky to identify to which app the helper tool belongs. Note that it is perfectly normal to see helper tools listed in Login Items.

running cat on it, it is bash script that

# This is a specialized randomizer function
# that will randomize when AU will be triggered
# for sceduled updates for a Mac

It randomises when the Java updater runs to see if there are updates. Mine runs at 19:58 on weekday 4 see

/Library/LaunchAgents/com.oracle.java.Java-Updater.plist