Saving ANSI in DVH without proper JSON

I am working with a solution that delivers 3 end points

The first end-point

https://data.mysystem.com/86fb92b5-ae9c

Data from this end-point is aleady in the DVH

id is the unique id for the attached document:

{
 "Type": "images",
 "fileName": "some_file_name.pdf",
  "id": "3de1cef70101",
  "mimeType": "application/pdf"
 }

The second end-point

To reterive the document the endpoint is

https://data.mysystem.com/attachment/<id>

This gives the output as ANSI

%PDF-1.7
%����
1 0 obj
<</Type/Catalog/Pages 2 0 R/>>
endobj
2 0 obj
<</Type/Pages/Count 21/Kids[ 4 0 R 27 0 R 31 0 R 37 0 R 46 0 R 48 0 R 50 0 R 54 0 R 56 0 R 60 0 R 62] >>
endobj
3 0 obj
<</MSIP_Label_7a2396b7-5846-48ff-8468-5f49f8ad722a_Enabled(true) /MSIP_Label_7a2396b7-5846-48ff-8468-5f49f8ad722a_SetDate(2022-10-05T08:45:49Z) /MSIP_Label_7a2396b7-5846-48ff-8468-5f49f8ad722a_Method(Standard) /MSIP_Label_7a2396b7-5846-48ff-8468-5f49f8ad722a_Name(Lav) /MSIP_Label_7a2396b7-5846-48ff-8468-5f49f8ad722a_SiteId(e6795081-6391-442e-9ab4-5e9ef74f18ea)(��

I want to save the ansi in DVH. How do i do that when the endpint (https://data.mysystem.com/attachment/<id>) only gives the ANSI as output?

The third end-point 

The third end-point is https://data.mysystem.com/86fb92b5-ae9c/pdf (append PDF at the end of first endpoint) to get a PDF view of metadata. Can i open this directry from a link that i can create in TX ot PBI? How?