Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1f7f0fac89a0e2…

MALICIOUS

PDF

12.0 KB
MD5: 4d3eef8dd36abf8e1d48adffdeb28f1e SHA-1: 7f87d59857ec2467a4fa0403e864f0d470cc336d SHA-256: 7a1f7f0fac89a0e2ed7c175d883e2d2c704327ccbc4b6ca84cb38a5bf2df5c8c
196 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 a vector for exploits. Heuristics indicate a critical PDF_XFA_HEAP_SPRAY, suggesting the presence of exploit code designed to spray the heap. Additionally, a critical PDF_XFA_SCRIPT firing indicates risky executable script within the XFA form. ClamAV detection of 'Pdf.Exploit.Dropped-78' further confirms its malicious nature. The embedded file and script payload suggest the PDF is a dropper for further malicious content.

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
98528abfe73628b77b07eef1ab9affcc8604d06a73104f64c7cfc359a0656062		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11527 bytes

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