Malicious PDF — malware analysis report

Static analysis result for SHA-256 600de0ef1f897767…

MALICIOUS

PDF

30.7 KB
MD5: 0dbfcfbe7f34a49a6139e10689844bcc SHA-1: 348eb220cdba0289e77eb4b01695e41e8bbe02ae SHA-256: 600de0ef1f897767fe733caf639827723f68eb78eca265dc6b1fcb426ae3aab0
246 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains XFA forms and embedded JavaScript, indicated by PDF_XFA and PDF_XFA_SCRIPT heuristics. The presence of PDF_EVAL, PDF_UNESCAPE, and PDF_FROMCHARCODE suggests obfuscated JavaScript code is used to execute malicious actions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of an embedded file payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • 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.
  • ClamAV: Pdf.Malware.Agent-7783238-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Malware.Agent-7783238-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • 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.
  • 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/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
7ef2c62da087a11dd0e820faef7325b9fa72d51db9d295e5925e1a770d2a0b63		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 30719 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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