I have received similar alerts from Wordfence Version 5.3.8 also.

Website: eiki.com

WP-Filebase Pro Version 3.2.11

I have manually deleted and re-installed WP-Filebase Pro Version 3.2.11 and re-scanned. The same malicious files and malicious text is reported.

1.Filename: wp-content/plugins/wp-filebase-pro/classes/Sync.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47L\x4fB\x41\x4cS”}[“.

2. Filename: wp-content/plugins/wp-filebase-pro/classes/Admin.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47\x4c\x4fBA\x4cS”}[“.

3.Filename: wp-content/plugins/wp-filebase-pro/classes/AdminGuiManage.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47L\x4fB\x41L\x53”}[“.

4. Filename: wp-content/plugins/wp-filebase-pro/sync.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
he text we found in this file that matches a known malicious file is: “${“\x47LO\x42\x41L\x53”}[“.

5. Filename: wp-content/plugins/wp-filebase-pro/classes/EmbeddedForm.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47\x4cOB\x41\x4cS”}[“.

6. Filename: wp-content/plugins/wp-filebase-pro/classes/Output.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47\x4c\x4fBA\x4cS”}[“.

7. Filename: wp-content/plugins/wp-filebase-pro/classes/ProLib.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47\x4c\x4fB\x41LS”}[“.

8. Filename: wp-content/plugins/wp-filebase-pro/classes/AdminLite.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47\x4c\x4fBA\x4cS”}[“.

9. Filename: wp-content/plugins/wp-filebase-pro/extras/pdf-utils.php
File type: Not a core, theme or plugin file.
Issue first detected: 2 hours 57 mins ago.
Severity: Critical
Status New
The text we found in this file that matches a known malicious file is: “${“\x47L\x4fBA\x4c\x53”}[“.

Concerned!

John