Download a PDF file from Azure blob storage and try to extract the text from it

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I am trying to download a PDF from an Azure blob storage and then trying to call the PdfDocument.Open(ms) function. The PDF is a very simple one containing following two words in it - Toy car

Below is my code:

`public async Task DownloadAttachment(string tenantId, string profileId, string fileName)
{
BlobServiceClient blobServiceClient = new BlobServiceClient(_config["ProfileStorage"]);
var attachmentContainerName = _config["ContainerName"];
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(attachmentContainerName);

        var containerexists = await containerClient.ExistsAsync();
        if (!containerexists)
        {
            throw new Exception($"Blob Container {attachmentContainerName} does not exist!");
        }
        var blobclient = containerClient.GetBlobClient($"{AttachmentContainerFolder.temp}/{tenantId}/{profileId}/{fileName}");
        string text = null;
        if (blobclient.Exists())
        {
            var downloadContent = await blobclient.DownloadStreamingAsync();
            
            using (MemoryStream ms = new MemoryStream())
            {
                await downloadContent.Value.Content.CopyToAsync(ms);
                try
                {
                    using (var document = PdfDocument.Open(ms))
                    {

                    }
                }
                catch(Exception e)
                {

                }                    
                
            }

        }
        return null;
    }

`

I get below exception on this LOC - using (var document = PdfDocument.Open(ms))

Exception details:

Exception message - Could not read the first token in the document at position 28937.

Stack Trace –
at UglyToad.PdfPig.Parser.FileStructure.FileHeaderParser.Parse(ISeekableTokenScanner scanner, Boolean isLenientParsing, ILog log)
at UglyToad.PdfPig.Parser.PdfDocumentFactory.OpenDocument(IInputBytes inputBytes, ISeekableTokenScanner scanner, ILog log, Boolean isLenientParsing, IReadOnlyList`1 passwords, Boolean clipPaths)
at UglyToad.PdfPig.Parser.PdfDocumentFactory.Open(IInputBytes inputBytes, ParsingOptions options)
at UglyToad.PdfPig.Parser.PdfDocumentFactory.Open(Stream stream, ParsingOptions options)
at UglyToad.PdfPig.PdfDocument.Open(Stream stream, ParsingOptions options)
at Eris.DocumentWorkFlow.Services.DocumentService.d__10.MoveNext() in C:\Users……