Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa3b5dc7ce8b6be…

MALICIOUS

PDF

13.3 KB First seen: 2026-05-08
MD5: 3835fc1525c9334d50b12476d06fdb1d SHA-1: fc78f2374002dade0ae9b30d32ca076c364a1c5d SHA-256: 0fa3b5dc7ce8b6be0baf0606f12d585e76954b002fc429c5c22b90524c46c188
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains malformed active content and an embedded script payload, strongly indicating an exploit attempt. The ML classifier assigned a very high probability of maliciousness. The embedded file, likely the exploit payload, is identified as a key indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 12850 bytes
SHA-256: 5d72ee2cd5fcf6480e3115b9f39717e1cac8190e9232eb880923879718f25dac

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