Malicious PDF — malware analysis report

Static analysis result for SHA-256 51275855c00e008f…

MALICIOUS

PDF

35.7 KB First seen: 2026-05-08
MD5: 6ca216f751ce275d488a6d12dd5adb2f SHA-1: e74da5dcc8a832fd40cfd12594fcca8e33f85ca7 SHA-256: 51275855c00e008f6e5135ca79de3e14d502395b6d972257bf3db4eb92f56880
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file exhibits suspicious characteristics, including the presence of embedded files and a script payload within a stream. The XFA form structure is also noted. While no document body text was available for content analysis, the embedded artifacts strongly indicate an attempt to deliver a malicious payload. The embedded files are treated as potential components of the attack.

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/xci/1.0/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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 46 bytes
SHA-256: 0a2224c4023b216235b61c3fc4dd17bbfac1ab23a545687f51b97604cf654712
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x138 671 bytes
SHA-256: 22e1c97367ed9363105664b944c5c54de2893177381e54aa84e7051d3d79c1ed
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x41C 150 bytes
SHA-256: 75d78b63cb265644662c07a711625865ff38bf8e8715d7f65d48b99eccbc42e0
embedded_file_obj0011.bin pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4F7 437 bytes
SHA-256: 919311c4f3a5f8d631c55fffd296ccf550fdb5d7b4350edc85e72b711cfc5686
embedded_file_obj0012.bin pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x6F1 181 bytes
SHA-256: 072090be5ea6c4a216543a1d4332d27d322264f3038bbd986db2a09048143a1c
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7EC 33868 bytes
SHA-256: 65c2c99fc890b52d0d73c6ecd3c24c026f3474b9137dc5516ab103f954619850

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