Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c933d1cb3ecdd7d…

MALICIOUS

PDF

12.3 KB
MD5: 4380c4b95e06b4b18f657805c6779020 SHA-1: 395345c0dd54049af8134e64651545ae72772bc5 SHA-256: 4c933d1cb3ecdd7d9c38dfcd41e69c07f1d9be24b37801caab93cf3121adfbac
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The heuristic firings indicate that the file contains XFA JavaScript heap-spray exploit code and risky executable script. The embedded script likely attempts to download and execute a second-stage payload, although the exact functionality is obfuscated. The presence of multiple Adobe and XFA-related URLs suggests a lure related to Adobe products or forms.

Heuristics 5

  • 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.
  • 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.
  • 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/xci/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00002475.bin
0774419da1d39c19b970c707e538ead8ffcc7be584a3704a7677c50a07acab7a		 pdf-embedded-script PDF raw stream script payload at offset 0x2475 3561 bytes

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