Hi, trying to create "by hand" first simple unecrypted .PDF file

Hi,

i am trying to create my very first .PDF file  "by hand".

It is just 1 line of text hopefully in Helvetica font size 12,

so it is very simple and no-encryption and no-compression.

I use a hex-editor to make sure my bytes are ok.

When i open my file in adobe-reader it is all blank page no text showing.

I went to this URL-link below and did what it says and still it is all blank page :

https://community.adobe.com/t5/acrobat-reader-discussions/reader-dc-show-s-only-white-page/td-p/9500094

Attached to this post is my file can you please tell me what i am doing wrong please, thank you for any help.