Problem with PDF files on Node.js and Typescript (blank pages)

Question

I'm trying to get PDF files from the internet and save them locally in a specific folder. It works well but the PDF files all have blank pages, I think it's an encoding problem but not sure. I'm stuck, can you help me?

await request({uri: file.url, headers: { 'Content-type' : 'application/pdf' }} , async (error, response, body) => {
                if (!error && response.statusCode === 200) {
                    if(file.isDuplicates) {
                        await fs.writeFileSync(`${path}\\generic\\${file.name}`, body, {'encoding': 'utf8'});
                    } else {
                        await fs.writeFileSync(`${path}\\${file.productId}\\${file.name}`, body, {'encoding': 'utf8'});
                    }

                }
            });

Thank you ;)