4-Heights appears on both legitimate first-generation output and downstream re-save flows — context (the other tool on the same document) is what flips the signal.
Back to all statisticsForensic verdictBased on 13 appearances across the HTPBE? corpus.
Corpus profile
4-Heights is one of the PDF-handling tools surfaced in the HTPBE? corpus. 4-Heights appears predominantly as the Producer (100% of its occurrences) — i.e. on documents whose original Creator was a different application and that subsequently passed through 4-Heights on the way out.
In the HTPBE? corpus the contextual signal we look for is a producer/creator mismatch: when 4-Heights appears as the latest Producer on a document whose Creator was an institutional source (e.g. Adobe PDF Library, Microsoft Word, a banking back-end), the document was rebuilt or re-saved after its original creation. That mismatch is the marker — never the tool itself.
On documents where 4-Heights acts as Creator, 0% carry modification markers; on documents where it acts as Producer, 85% do. These are observed rates inside the HTPBE? corpus and should be read as base-rates, not as accusations against 4-Heights or its users.
Role in the workflow
Every PDF carries a Creator (the application that produced the original document) and a Producer (the engine that wrote the PDF). The same tool can appear in either slot, with very different modification profiles.
Distributions
The PDF versions 4-Heights writes when acting as Producer, and the other tools that appear in the same documents.
Most output is PDF 1.7 (75% of files where 4-Heights is the Producer).
Chrome (Print to PDF) sits upstream in 83% of cases — read this row as “what kinds of documents end up routed through 4-Heights.”
Related profiles
Other tools that frequently share metadata with 4-Heights in the same documents. Each card links to its own forensic profile.
Long tail
Smaller cuts of the 4-Heights corpus — useful context, but treat each row as a single data point rather than a strong signal.
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