When merging, CFPDF indicates that a bookmark name can be added by using the following syntax to CFPDFParam as:

<cfpdfparam file="filename desc="">

But this doesn't appear to be valid. It's "filename", not "file", right? It's "description", not "desc", right? In which version did "description" get added? It hasn't been there since v8, has it? When merging, the attribute to use is "source", not "filename". ??? Here's a link to the official docs. https://helpx.adobe.com/coldfusion/cfml-reference/coldfusion-tags/tags-p-q/cfpdf.html

Yes looks like the attributes are "filename" (required) and "description" (optional). Yes, the "source" is used to merge other PDF to the current...

<cfpdf action="merge" name="MergedTogether">

<cfpdfparam source="folder/1.pdf">

<cfpdfparam source="folder/2.pdf">

</cfpdf>