Malicious PDF — malware analysis report

Static analysis result for SHA-256 c284a783ac3c1510…

MALICIOUS

PDF

10.5 KB First seen: 2026-05-08
MD5: 41c71617fc3302bf39cd725f07a31523 SHA-1: fbd131f561586a781805caef2308f48e8da0bd73 SHA-256: c284a783ac3c151002a2dd01c877f0c4b575f74617a4cbc947edcb7d4f416948
80 Risk Score

Malware Insights

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

The PDF file contains embedded script payloads and XFA form elements, indicating an attempt to execute code. The presence of an embedded file and an AcroForm button with an action trigger further supports this. The embedded URL is likely part of the malicious functionality, though its specific purpose cannot be determined from the provided data. The script execution is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.xfa.org/schema/xfa-locale-set/2.1/ In PDF document text
    • 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-data/1.0/In PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xB03 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xBB5 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj0121.bin pdf-embedded-file PDF EmbeddedFile object 121 at offset 0xDCF 72129 bytes
SHA-256: 090f57ad2d5810adf50c082e1aac4c39edc8b30b8f03116e7ebf5e178143b263
Detection
ClamAV: No threats found
Obfuscation or payload: likely
39 of 63 identifiers look randomly generated (e.g. 'zYIWnFMceWIpccMYgrcuSqehLsr'); 17 string-concatenation chain(s) — consistent with name-mangling obfuscation.
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x2488 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2535 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275

Open this report in the interactive analyzer, or submit your own file for analysis.