Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f09f62fe2721f2c…

MALICIOUS

PDF

12.8 KB
MD5: 97521758dcfd435f16ca2be54d5b13cd SHA-1: d8a5c70dc6ce2b19d783a72099732499755637ce SHA-256: 4f09f62fe2721f2c621f79a883e161c7e847b81135e68828dd1c3058d48fe246
226 Risk Score

Malware Insights

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

This PDF document contains a critical XFA heap spray exploit, indicated by heuristic firings like PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT. The exploit likely leverages embedded JavaScript within the XFA form to execute malicious code, as suggested by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. The ML classifier and ClamAV detection strongly support its malicious nature, identifying it as Pdf.Exploit.Dropped-78. The primary attack vector appears to be the exploitation of XFA form vulnerabilities.

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
2627b16802bc86dcdb42b5fd307c6b5093d4023a0bfff4cf99684f65929acf2c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12312 bytes

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