Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ea0d8474aadf7…

MALICIOUS

PDF

11.9 KB
MD5: e8a116aff11471c218b75008dadf4dd3 SHA-1: aa698cbbfdc72c62041507840987724396a3718a SHA-256: da2ea0d8474aadf786245e734ba6e3946ed2d58a3e794bd31eed491016a70612
228 Risk Score

Malware Insights

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

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. The critical PDF_XFA_HEAP_SPRAY heuristic indicates the presence of exploit code designed to spray the heap, likely to facilitate shellcode execution. The ML classifier strongly flags this as malicious, and ClamAV identifies it as Pdf.Exploit.Dropped-78, confirming its malicious nature. The embedded file and script payload further support the delivery of a secondary malicious component.

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
4064662666d6f91bea6e6022880904056152f5d93ca89b77b34a6e78a5486d7b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11439 bytes

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