Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a7285e6fa9b748…

MALICIOUS

PDF

11.9 KB
MD5: 0c10fa9af8e2e33b16c406e93553acf4 SHA-1: 76e86cdd29be646ed390eaadcd9d8bf5ff15df74 SHA-256: e1a7285e6fa9b748ac448999feed964904a805223a35e59c24b9c017f2959141
226 Risk Score

Malware Insights

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

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to spray the heap, likely to facilitate shellcode execution. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Exploit.Dropped-78'. The embedded script payload and risky executable script within the XFA form suggest it's designed to download and execute a second-stage 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
08e889260565dd3cf86e95a6bc51c3eee64aa7530ff5423e3d95d566f2997f2b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11386 bytes

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