Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea968fcf857ca9e…

MALICIOUS

PDF

12.2 KB
MD5: 5e400b5854f621d16e62e3bd77c99b63 SHA-1: ebcea0132a5594fd4e4d55644242cb864f487d00 SHA-256: fea968fcf857ca9e848cdd40a9655cafb72b082fd1560992ccbbc6792e114fd5
196 Risk Score

Malware Insights

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

The sample is a PDF document that leverages XFA forms and embedded JavaScript to perform a heap spray attack, indicating an attempt to exploit a vulnerability. The ClamAV detection 'Pdf.Exploit.Dropped-78' further supports this. The embedded script is likely designed to download and execute a second-stage payload, although the specific details are obfuscated. The presence of XFA forms and associated JavaScript points to a common exploit delivery technique.

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
8f2b0e8466d259fe748af70331f78248fb5182c39da64855402aff10ee4d19e6		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11688 bytes

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