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How can I automatically decrypt PGP self-degrading file?

Every day I get SDA files for which I have a phrase. Decryption is performed by launching the file and entering the password in the program window that opens. I would like to avoid this manual step and turn it into a step of an automated process.

How it works: As soon as my daemon detects that a new file has appeared in my mailbox, my program will download, decrypt and save it. I know how to do all this with code, except for the decryption part.

Instead of launching the .exe file and manually entering a passphrase, I want to read its contents and use phrases to decrypt the data contained in it, which looks like this:

4d5a 9000 0300 0000 0400 0000 ffff 0000 b800 0000 0000 0000 4000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 f000 0000 0e1f ba0e 00b4 09cd 21b8 014c cd21 5468 ...etc

The language I'm currently using is PHP, but analyzing the implementation in any language will help.

Any ideas?

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The self-expanding PGP archives are simply the message of the EXE + stub + PGP inside this file. You have to parse the EXE headers and find where this data is stored, extract and decrypt it using GnuPG or any other PGP library.

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