Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78320b52d06e98c…

MALICIOUS

PDF

1.95 MB
MD5: eb52c60788f0f8392852e62d384556f7 SHA-1: d7f99ed5da1fee51b7722af701d4c6edb8ef1bf9 SHA-256: e78320b52d06e98c07a17d56246e3951b8c6e19412f14ae92f7b9fbd57622da4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 Command and Scripting Interpreter: JavaScript

The sample is a PDF containing an XFA form with a critical heap-spray exploit trigger. The document body contains heavily obfuscated JavaScript-like fragments that appear to be part of a shellcode delivery mechanism. No clear second-stage URL or command was reconstructed from the truncated body text, but the presence of PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT heuristics confirms the intent to achieve remote code execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • Embedded script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/xci/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000aa0.bin
04157095676b4ccf8b6ddae8bb678f499213e042e8e26329c656c652a94d0062		 pdf-embedded-script PDF raw stream script payload at offset 0xAA0 85139 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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