Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cec0ffe559afad3…

MALICIOUS

PDF

12.0 KB
MD5: e861ccfffdf62166f3f3f8fd172b5012 SHA-1: 142b09c545bddee52ce643b9593c22ee0d6ec5f2 SHA-256: 9cec0ffe559afad31efbfff61986dc26cde3eb6b37e1be4674a4ee134219d29f
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.007 Scripting: JavaScript

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. Heuristics indicate the presence of exploit code and risky executable script within the XFA form, specifically targeting a heap spray vulnerability. ClamAV detection confirms this as Pdf.Exploit.Dropped-78, suggesting it's a dropper for further malicious content. No document body text was available for analysis, but the technical indicators strongly suggest exploitation.

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
4284792d084485b5d0243b39242bb7b5fd63926e7ecc244a50bf30ab6137fe12		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11559 bytes

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