PDF does not show properly all Non ASCII characters

[pedjas]

I am creating relatively simple PDF document but I fill it in with content that contains Serbian specific non-ASCII characters (both Latin and Cyrillic). Some character show up as expected but some are replaced with question mark character. It seems like code page issue.

Data I am using is all UTF8. I checked everything and I am sure that I provide proper UTF8 to Cezpdf

PDF looks like wrong code page is applied. I cannot find option to force UTF8 on PDF document creation. Is that possible?

Here is example of code I use: test.zip

I tried this example with few PHP versions and I always get the same result.