PDF-Fragenkatalog in CSV umwandeln

Code:

Help me extract information from this pdf. The pdf contains Multiple Choice Questions and its associated answers, beginning on page 3 up to page 22. 

Output the Number of the question, the question, possible answers and the choices available in a csv, like described below.

Ignore all content that is not recoqnizable as part of the quiz, like images, graphs, copyright remarks and so on.
also ignore the headers (example: "10 Luftrecht ECQB-PPL(A)" ) and footers (example: "v2019.2 21") of the pdf.

There are two kinds of questions. Questions like the first (1) on page 3 and questions like the second (2) on page 3. 

For the first kind use the following approach:
Use the first column for the Questions Number, second column for the question, third column for the possible answers, fourth column for the first choice, fifth column for the second choice, sixth column for the third choice, seventh column for the fourth choice. 

Like in the following example:
***
Number|Question|Options|1st Choice|2nd Choice|3rd Choice|4th Choice
1|Welche dieser Dokumente müssen auf internationalen Flügen immer mitgeführt 
werden?|a) Eintragungsschein b) Lufttüchtigkeitszeugnis c) Bescheinigung über die Nachprüfung der Lufttüchtigkeit d) EASA Form-1 e) Bordbuch f) Entsprechende Ausweise für jedes Besatzungsmitglied g) Technische Lebenslaufakte (1,00 P.)|b, c, d, e, f, g.|d, f, g.|[x] a, b, c, e, f.|a, b, e, g.
***

For the second kind use the following approach
Use the first column for the Questions Number, second column for the question, leave the third column empty, fourth column for the first choice, fifth column for the second choice, sixth column for the third choice, seventh column for the fourth choice. 

Like in the following example
***
Number|Question|Options|1st Choice|2nd Choice|3rd Choice|4th Choice
2|Wie wird ein Gebiet bezeichnet, in welches der Einflug nur mit bestimmten Auflagen 
erlaubt ist? (1,00 P.)|null|Gefahrengebiet|[x]Flugbeschränkungsgebiet|Flugverbotszone|Luftsperrgebiet
***

Make the csv downloadable, use a charset suitable for german, use "|" as a delimitter.

Code:

{
    "top": 0,
    "nr": 2,
    "imgs": [],
    "txt": "Wie wird ein Gebiet bezeichnet, in welches der Einflug nur mit bestimmten Auflagen\nerlaubt ist? (1,00 P.)",
    "corans": 2,
    "ans": [
        "Luftsperrgebiet",
        "Gefahrengebiet",
        "Flugbeschränkungsgebiet",
        "Flugverbotszone"
    ]
}

Code:

const XLSX = require('xlsx');
const data = [{"id":"ppl_..........,"ans":["1630","1330","1430","1230"]}]}]
   
const workbook = XLSX.utils.book_new();
const worksheet = XLSX.utils.json_to_sheet(data[0].questions.map(item => ({
    Frage: item.txt,
    Antwort: ['A', 'B', 'C', 'D'][item.corans]
})));

XLSX.utils.book_append_sheet(workbook, worksheet, "Fragen und Antworten");

XLSX.writeFile(workbook, "fragen_und_antworten.xlsx");

Code:

const XLSX = require('xlsx');
const http = require('http'); // or 'https' for [url]https://[/url] URLs
const fs = require('fs');

const data = [{"id":"ppl_..........,"ans":["1630","1330","1430","1230"]}]}]

const workbook = XLSX.utils.book_new();
const worksheet = XLSX.utils.json_to_sheet(data[0].questions.map(item => ({
    Frage: item.txt,
    Antwort: ['A', 'B', 'C', 'D'][item.corans]
})));

XLSX.utils.book_append_sheet(workbook, worksheet, "Fragen und Antworten");
XLSX.writeFile(workbook, "fragen_und_antworten.xlsx");

var imgs = [...new Set(data[0].questions.filter(item => item.imgs.length).map(item => (item.imgs)).flat())]
for (i in imgs) {
    console.log('http://ato.fsv2000.com/fragenkatalog/imgs/' + imgs[i]);
    const file = fs.createWriteStream(imgs[i]);
    const request = http.get('http://ato.fsv2000.com/fragenkatalog/imgs/' + imgs[i], function(response) {
        response.pipe(file);
        file.on("finish", () => {
            file.close();
            console.log("Download Completed");
        });
    });
}