Empty text files - dl.txt and t.txt

I recently found these files on my hard drive and wondered what they are.  They are blank when opening in text edit.  Could they be malware?  I googles dl.txt and it seems to show up a lot in torrent sites.  Neither me or my husband ever use these sort of sites. 
Is it safe to delete these files (they are in the trash right now).  Are there any other mysterious txt files I should be concerned about?
Thanks for the help!
Karen

Text files are not executable files so they are not going to do anything themselves.  Short of having some sensitive info in them and you mailing them somewhere they aren't going to do anything.
One caveat in that statement.  A text file could be an executable file but you would immediately know that because if you attempted to view it with a text editor it would look like gibberish to you, not a readable file.  Further the executable flag needs to be set in the permissions.   You can always view the permissions with the terminal ls command.
Here's some references about permissions:
Who Goes There? Understanding Permissions in UNIX
Understanding file permissions on Unix: a brief tutorial
Or just google "understanding unix permissions".
Note even if a text file is executable code, something or someone needs to launch it.  For the case of "something" there would be other code somewhere in you system to do that.  That other code would usually be launched from various places looked at when booting or logging in.  Items that cause launches when booting will appear in the following directories:
/Library/LaunchAgents
/Library/LaunchDaemons
/Library/StartupItems
Items that are launhed when you log in are in,
your login items
~/Library/LaunchAgents (in your home directory)
It is your login items and all these directories you should first look at for possible malicious actions.  You probably already have stuff in some of these already because some applications use them to start helper processes to do their work.  Don't worry about what you currently see.  Only worry if you suspect malicious or just plain unstable behavior.

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