What I've got, so far, requires that you have Pages set up to sync using iCloud Drive, GoodReader installed, the Workflow app, and a semi complicated workflow script. You also have to copy the file from iCloud Drive to GoodReader using it's own Import feature. Adding the file to GoodReader by any other method updates the date fields.
Since both of these apps cost money, and I can't guarantee the creation date on the file hasn't been updated, and therefore not retrievable, I'm not certain this would be worth your while. But it's the only thing I've come up with so far. At the least, you would not have to create the workflow action yourself. I've already done so and can easily share it here. Or a download link for it anyway.
If you want to do this, let me know, and I'll supply the link and a more detailed description of how to make it work. Again, without guaranteeing that you'll actually get the information you need. After all, it is possible it is no longer in the file to be retrieved.
Here's how the workflow action results look from inside GoodReader.
The workflow itself works inside Pages, but for some reason the dates always show up as the current date and time. This is true of almost every app I tried other than GoodReader. I think that is because they try to pull the file info from iCloud Drive directly, instead of downloading the file to local storage first. GoodReader only works if I do download the file. If I try to view it without copying it to GoodReader the same error occurs.
It's possible an update to Workflow will fix this, or not.