Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b715f2457cbcaaf…

MALICIOUS

PDF

12.0 KB
MD5: a108d93eaab8e3a8111235d32d23807b SHA-1: 005e51e218ce9119198e5fc9f921afc638a6f026 SHA-256: 4b715f2457cbcaafc92b495d35575688271101ae116d6214fee00a2a44e58357
226 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to leverage this vulnerability. The embedded file and ClamAV detection further confirm its malicious nature. The primary attack vector appears to be exploiting XFA's scripting capabilities to execute arbitrary code.

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
509065b308c4ef0326342485b6897a1187d7d5d32cd9e38b86697637e882de80		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11577 bytes

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