strange folder found in wp-includes/images

we’re currently having problems with twitter cards for our site where the twitter:title meta tag is being replaced for some reason when being pulled by Twitterbot. upon checking our site, i found this strange folder in wp-includes/images

wp-includes/images/cache669c54f0e09104595f67a7043c1b8db9

i have no idea what it is. I tried deleting it but it gets recreated every time.

has anyone seen this before? i couldn’t decipher the contents. here is a link of the contents

https://www.filehosting.org/file/details/751114/check_folder.zip

it was suggested to us that we could have a malware somewhere inserting something when being fetched by twitter bot. not sure if this is the one but it would help shed light on some issues if we could determine what this is

thanks