Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8653eaea1bd434…

MALICIOUS

PDF

23.2 KB Authoring application: 42.141.63.126.104.82.71.126.104.80.72.154.145.132.147.92.70.70.90.133.142.145.71.136.92.79.90.136.91.126.104.80.77.139.132.141.134.147.135.90.136.74.92.81.72.154.129.92.126.104.80.77.146.148.129.146.1 (via 48.141.130.147.136.142.141.63.126.137.82.71.72.154.126.137.83.92.126.139.84.71.72.90.136.133.71.126.137.83.91.88.79.79.79.72.154.126.137.84.92.70.142.74.148.96.114.137.134.134.134.138.143.148.107.83.9) First seen: 2026-05-09
MD5: f02a20523baa6954f299b0ec8f075217 SHA-1: 8133c7f19e5c7d7fa44c05b129c93e6bcd7c0096 SHA-256: 7f8653eaea1bd4340f04cab49189abf853ba40b4cabc094a046bee053c470a31
114 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains XFA forms with risky executable scripts, indicating an attempt to exploit vulnerabilities for client execution. The ML classifier strongly flagged this PDF as malicious. Embedded files, particularly 'embedded_file_obj0043.bin', are likely payloads or components of the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Embedded script payload in PDF stream low 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.
  • 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
  • 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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/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-template/2.2/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x3982 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x3A34 1183 bytes
SHA-256: b40a217a8d9b8d3671cc3874c550d30941b93ca6dde99995d43921dede579865
embedded_file_obj0043.bin pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x3C84 1718 bytes
SHA-256: f8f1835bfee99f1de38ba2d61f82060d16ad1cdadfc50fd6a03b4489ad79e01d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x404D 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x410F 2427 bytes
SHA-256: ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd
font_00_cff_off000044df.bin pdf-font-stream PDF embedded font (cff) at offset 0x44DF 1192 bytes
SHA-256: 062eede2d0cc5d3972869dc7e2f2f9f01d1d1b3756b715c8252f06948ce99ae2

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