Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ae23b8ba9c4b0e…

MALICIOUS

PDF

62.7 KB
MD5: c392effb1d5816dba775c1b241a3d939 SHA-1: 489fda9b2f9e1ba1c9bb4af00af1d18f81919c2b SHA-256: 70ae23b8ba9c4b0ed92d9ceffd5b79fe2a360ba5ff0d6759d4be25a52dbdf455
150 Risk Score

Malware Insights

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

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The embedded JavaScript within the XFA form is designed to trigger this heap spray, likely to facilitate the execution of malicious code. The presence of an unknown URL, http://g3453453h12378y213.com, within the script suggests it may be used as a command and control server or a download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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.
  • 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.
  • 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://g3453453h12378y213.com
    • 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_00000d59.bin
ff079fb1dfcaf465765ca4ac8a69dd4468a67b8bc7e3f463843b43aff3a20804		 pdf-embedded-script PDF raw stream script payload at offset 0xD59 61536 bytes

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