Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a09e9b560f45ac…

MALICIOUS

PDF

12.4 KB
MD5: be0f144291623835379ff64d0f62d644 SHA-1: 8dc5fa934dfbbf52e228fd2ac5866bd8812455bb SHA-256: 48a09e9b560f45ac1a75d994f9498b7a836ba95d9f1d1b03a8a199c7119527b8
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to spray the heap, likely to gain control of execution flow. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Exploit.Dropped-78'. No specific script content was readable, but the presence of XFA exploit code strongly suggests the intent to download and execute 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
8bbe6426b8deed3174546c70f68ea03a4c77379cf2260c8507ae5a181f1daf1d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11966 bytes

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