Hi,
In the HikaSerial>Packs menu, you can configure different packs.
Then, in the HikaSerial>Plugins menu, you can configure several sets of plugin settings for each plugin, including the attach PDF plugin. And in each one, you can select the corresponding pack.
Then, when you edit a product in HikaShop, you can associate the product with the corresponding pack.
So, this way, you should be able to use the attach PDF plugin both for what you're already doing with it and for the tickets.
Potentially, you could even have products linked to several packs, and thus several PDFs could be generated for the sale of each of these products.