strange textedit app documents appearing

21.5 IMac desktop, 2.5 GHz 1333 MHz, mid 2011, 8 GB Ram, Yosemite 10.10.5

A group of zero byte, textedit.app Document files with unintelligible names recently appeared on my HD, and I have no clue how or why they are there. There have been no suspect downloads or actions, other than some file sharing between home computers that I manage personally, and everything seems to be in order otherwise on this system. I ran EtreCheck and no adware or other problems seem to be an issue. I've included a screen shot of the mysterious files and the only red item noted on the EtreCheck scan. I'm assuming the files are harmless, but I would appreciate any ideas about their source and if they indicate any damage or security issues. Thanks.

EtreCheck version: 2.9.12 (265)

Report generated 2016-05-12 15:55:24

Download EtreCheck from https://etrecheck.com

Runtime 2:16

Performance: Excellent

Time Machine: ⓘ

Mobile backups: OFF

Auto backup: YES

Volumes being backed up:

HD: Disk size: 499.76 GB Disk used: 192.15 GB

Destinations:

iMac backups [Local]

Total size: 999.86 GB

Total number of backups: 17

Oldest backup: 1/3/16, 7:51 PM

Last backup: 5/12/16, 3:28 PM

Size of backup disk: Adequate

Backup size 999.86 GB > (Disk used 192.15 GB X 3)

Top Processes by CPU: ⓘ

61% mdworker(10)

15% WindowServer

6% com.apple.WebKit.WebContent(2)

4% kernel_task

4% Safari

Virtual Memory Information: ⓘ

615 MB Free RAM

7.40 GB Used RAM (1.93 GB Cached)

0 B Swap Used