Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0439e74e26725a…

MALICIOUS

PDF

14.6 KB Created: 2010-10-15 14:23:58 Authoring application: yen vaw First seen: 2013-04-13
MD5: 2ec3ed0121ea11b88d09f24a78923df2 SHA-1: a84019d5b12ba6f9433e04c96426a9d357a1c608 SHA-256: cb0439e74e26725a58d9d43652cfb69e3886fbdd1bca535e643190182245510d
252 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains critical XFA heap spray exploit code and embedded script payloads, indicating it's designed to execute malicious JavaScript upon opening. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URL is likely part of the exploit chain or a secondary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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.
  • ClamAV: Win.Exploit.JS-296 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Exploit.JS-296
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
    Matched line in script
    <template xmlns="http://www.xfa.org/schema/xfa-template/2.5/"><subform layout="tb" locale="en_US" name="haj"><pageSet><pageArea id="are" name="are"><contentArea h="756pt" w="576pt" x="0.25in" y="0.25in"/><medium long="792pt" short="612pt" stock="default"/></pageArea></pageSet><subform h="756pt" w="576pt" name="nae"><field h="65mm" name="caw" w="85mm" x="53.6501mm" y="88.6499mm"><event activity="initialize" name="kif"><script contentType="application/x-javascript">pud=0.001;pud+=0.0709;pea=true;j …
  • 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 script payload in PDF stream info 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://www.xfa.org/schema/xfa-template/2.5/ In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0xD91 84 bytes
SHA-256: d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xE42 228 bytes
SHA-256: 24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0
embedded_file_obj0019.bin pdf-embedded-file PDF EmbeddedFile object 19 at offset 0xF33 199 bytes
SHA-256: c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460
embedded_file_obj0010.bin pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x1024 119 bytes
SHA-256: 31f5aedad71f58cdda2662f0e242f75cc76ccd54d8d2c6562dedfe420c434e1e
embedded_file_obj0018.bin pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x10DB 77 bytes
SHA-256: e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876
embedded_file_obj0015.bin pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x1182 56 bytes
SHA-256: 92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x14B6 9098 bytes
SHA-256: 0b0c0b95d16252ea3648413d2fd4efd747d89b887c9508a080788bc7639501fc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).

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