WordPress Security - Base64 and eval

WordFence has a scanner that can find base64 and eval code. You can use CPANEL file manager to search files. Do you have ssh? If yes, you can use that to sleuth out and review base64 and eval code. Here are some handy snippets:
SSH Find base64

find . -name "*.php" -exec grep "base64" '{}' \; -print &> b64-detections.txt
find . -name "*.php" -exec grep "eval" '{}' \; -print &> eval-detections.txt

Find php files in the uploads folder. Run command rom wp-content directory.
find uploads -name "*.php" -print
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