Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d99c505cc41551…

MALICIOUS

PDF

86.5 KB
MD5: 286ab7f30641103586138d2ece36b56d SHA-1: d639050ea383f579b0f61b13b3a3611de9dd99cf SHA-256: c4d99c505cc415514104a01ad8971fcc4a0f4c4adc9ca594bc6abe4ac4a48380
250 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The sample is a PDF document that utilizes XFA forms and embedded JavaScript to trigger a heap spray exploit. This exploit targets CVE-2010-0188, a known vulnerability in Adobe Reader's LibTIFF component, allowing for arbitrary code execution. The embedded script is designed to download and execute a second-stage payload, although the exact nature of the payload could not be determined due to obfuscation. The primary IOC is the file hash itself, as no external URLs were identified as malicious.

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • XFA form contains executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose dataset contains a <script> or <xfa:script> block — XFA scripting has been the exploit primitive for several Adobe Reader RCEs (CVE-2010-0188 family, CVE-2018-4901, and others). Plain XFA without scripts is far less risky.
  • 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.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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/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_pdf_script_0000023c.bin
d64d525c7c2e577645aac0fb9a8fb707a5d3bec782b0ff9f18789c377b3150d9		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 87821 bytes

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