Malicious PDF — malware analysis report

Static analysis result for SHA-256 f535dd378aaff626…

MALICIOUS

PDF

12.1 KB
MD5: c53eaf458d6a05943f7371c2e520cb3e SHA-1: 04bc53e53a474950a5f27b80f3d320ef569b479b SHA-256: f535dd378aaff626185361a00b0dc171b939e54c4fa857119481ed323c4f59cd
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF file contains XFA forms with JavaScript that triggers a heap spray exploit. This exploit is designed to download and execute a secondary payload, as indicated by the 'Pdf.Exploit.Dropped-78' ClamAV detection. The ML classifier strongly supports the malicious nature of this file.

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
c4bcda859b7044c1483299d2417548d30da8c81f8d0c922ebe773932863b0511		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11655 bytes

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