Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d594883005e420c…

MALICIOUS

PDF

65.3 KB
MD5: 1c238fb50c8014125b30e86d9d9ed2cb SHA-1: 1721f2c56208dd3d8ed2b58608def72eeeb67926 SHA-256: 8d594883005e420c4d595736bf6016591fe5515be1c7fce918017a5d54123764
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. Heuristics indicate the presence of XFA JavaScript heap-spray exploit code and a risky executable script. The ML classifier strongly flags this PDF as malicious. The embedded script, 'embedded_pdf_script_00000aa0.bin', likely contains the payload for the exploit, aiming to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
db106e9aa5c5b4c90530c886d33e80359bce09727f82362111319cbc81b500a6		 pdf-embedded-script PDF raw stream script payload at offset 0xAA0 64094 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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