# Notes**Category: Web**
This challenge will take an input and render it as a PDF:

The PDF.js library logged a result to the console: `PDF 3a7b66944d4e7ee9f77b1dede8dbb10c [1.5 pdfTeX-1.40.22 / TeX] (PDF.js: 2.14.305)`
This exposes that these are generated with pdfTeX. We can try a malicious LaTeX command and see if it works:

This works, and also shows us we have a user directory in `/home/professor`.
The site mentioned AWS credentials, let's fetch those:

I modified my own credentials file to contain the professor's login:
```[default]aws_access_key_id = AKIAS6CCIWVV6RMQNP6Caws_secret_access_key = a8NvuO7gAKpVu+K5XEL+PPvH8k0SKnRg/ZsF9N2z```
```$ aws s3 ls2022-06-10 14:49:19 professorsnotes
$ aws s3 ls professorsnotes2022-06-10 14:54:24     867970 certificate.pdf
$ aws s3 cp s3://professorsnotes/certificate.pdf .download: s3://professorsnotes/certificate.pdf to ./certificate.pdf```
The certificate contains the flag!
