Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e3a8397092bf1e…

MALICIOUS

PDF

5.6 KB First seen: 2026-05-09
MD5: ff42ea1b48575284a1f727c1180f5ffd SHA-1: 48b8e212152af42f58cafd3ec218d5f97f55165b SHA-256: f4e3a8397092bf1e7df30398efe278d02edbd6006cafa692c5a7fc969a69c4ec
72 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Mark-of-the-Web Bypass T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file exhibits multiple indicators of malicious intent, including embedded objects and scripts. The presence of XFA forms and embedded files points towards a delivery mechanism for a secondary payload. The obfuscated script content within the PDF stream is a strong indicator of malicious activity, likely aimed at executing arbitrary code or downloading further malware. The embedded URLs, while some are benign, are part of the overall structure that facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Suspicious extracted artifact info 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.
  • 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 0x78 5069 bytes
SHA-256: af10294a4f9b29b97abdb3189c17e145d1a8bede6e806f9c5f1226713ca3166f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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