Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d100c4bc29effb0…

MALICIOUS

PDF

12.7 KB
MD5: 20f53e04745192cc89f1b8d4da2ea7f0 SHA-1: 1b2689b40bd9fe651426ea3629f86baf9f3f09a8 SHA-256: 4d100c4bc29effb0f8fc11b7b2b709d285c31f508c5a6624b68c96a563d78970
228 Risk Score

Malware Insights

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

The critical PDF_XFA_HEAP_SPRAY heuristic indicates that this PDF contains exploit code designed to trigger a heap spray vulnerability within XFA forms. The PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics further confirm the presence of executable script content. ClamAV detection as Pdf.Exploit.Agent-6136306-0 strongly suggests malicious intent. The ML classifier also flagged this as highly malicious. The embedded file and XFA structure are consistent with exploit delivery mechanisms.

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.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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
1577de0b9f4118857426214b034d1bdcaed2c3c01636b6e8f1fe03a9a9f8aa8a		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12285 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.