sql server 2012 – I can’t identify what is happening in this table with a PDF on it

I have a table with this config:

enter image description here

Now if you look at COLUMN_11, it is a varchar -1.

But as far as I know, to insert a PDF file into a table, you need filestream, and the column should be VARBINARY(max) right?

so, how is this working? why is there a PDF in a VARCHAR column?

the DocumentBody is this:

enter image description here

Obviously theres millions of this one.