Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28b5b2f2249cadb…

MALICIOUS

PDF

12.0 KB
MD5: d724954111a9371e85b6d60782dbc1e2 SHA-1: 729645de37e1ea250c4937b6e5528a3ed1bdba0c SHA-256: c28b5b2f2249cadb01eee1d384409aeca470f79e27ff3ebb8ceeeabda464362b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1190 Exploit Public-Facing Application

The PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Critical heuristics indicate a PDF_XFA_HEAP_SPRAY, suggesting the presence of exploit code designed to spray the heap. Additionally, PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_XFA_SCRIPT firings confirm executable script content within the XFA form. The ClamAV detection of 'Pdf.Exploit.Dropped-78' further solidifies the malicious nature, indicating it likely drops a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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.
  • 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
  • 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
b81efc62c71d1996d59655c4acbf3a841229c775e6f883a8d424dbcc40a1ce07		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11527 bytes

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