Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ceece73a3f64c9…

MALICIOUS

PDF

13.3 KB First seen: 2026-05-08
MD5: 657e56fa6d5463216bebd2c043a71e1d SHA-1: 8d8d0379ae53862be85746a35dd7d083852d466e SHA-256: 59ceece73a3f64c9e0d9b403afb491e9eb278bf6c0bdc69cc9e7cb092399c89b
70 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. This suggests an attempt to exploit vulnerabilities within the PDF viewer to execute malicious code. The presence of XFA forms and embedded files further supports this, as these can be used to deliver exploits. The embedded URLs are related to XFA schemas and Adobe, but their reputation is unknown or benign, providing no direct IOCs for the payload itself.

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 12886 bytes
SHA-256: 192e957a38cf17615895862e978b1d3a54f6a4f21848438813a502d73bba4ee0

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