PDF malware analysis — malicious · c336f1bdee4ceece

MALICIOUS

PDF

30.35 MB Authoring application: pypdf First seen: 2026-06-09

MD5: 8a7fa0079c4a464c65ab85af3e4970be SHA-1: 21fe2b54ae52f165c5ef2516b08caae34b4dc223 SHA-256: c336f1bdee4ceece88bc7d89b3449a881c61e1a338668cb543daaf5aabaea175

138 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
JavaScript action low 1 related finding PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser timed out. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.microsoft.com/SMI/2016/WindowsSettings In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`update.dat`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x120F5AD	4194304 bytes
SHA-256: `adb89a0db769d6f5275c8e1b0925dbd0aa63987f2615586554323b8e6fe46b42`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=update.dat; kind=pdf-embedded-file
`embedded_pdf_0120f5ad.exe`	embedded-pe	PDF raw stream PE payload at offset 0x120F5AD	8388608 bytes
SHA-256: `99c451fd0091499aff01795d779545b400aa99357464a145ff16a8b7d448745c`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=embedded_pdf_0120f5ad.exe; kind=embedded-pe

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