Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1e84eb89007b48…

MALICIOUS

PDF

84.3 KB
MD5: 05b7ab8de7f53b93522ea6371cdce79c SHA-1: 3f6d5cc6e48cd34dd7fa3ca0a1cb56192e41be32 SHA-256: bd1e84eb89007b488fd7cf86aeca8815288c5f73021022ac0797c55f2ac572cc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File

The PDF sample contains XFA (XML Forms Architecture) content, which is known to be a vector for exploits. Heuristics indicate a heap spray exploit targeting XFA JavaScript, along with embedded script payloads. The ML classifier strongly flags this PDF as malicious. The embedded script likely attempts to download and execute a second-stage payload, leveraging the heap spray for code execution. The presence of multiple Adobe and XFA-related URLs, while mostly benign, are part of the XFA structure that facilitates this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
fbcd820b8f0b52ed5cccab92c91427eb2f8f588b9a05f8f61b32c7eb97cf2279		 pdf-embedded-script PDF raw stream script payload at offset 0xAA0 83619 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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