Malicious PDF — malware analysis report

Static analysis result for SHA-256 615bd4c4ca6eb1c8…

MALICIOUS

PDF

14.7 KB Created: 2010-10-15 14:23:58 Authoring application: yen vaw First seen: 2014-04-29
MD5: 60e91f2988b5e2c1626977ec08d654aa SHA-1: 1a19525ccc9d6d2c0339b01994ac7d099f177070 SHA-256: 615bd4c4ca6eb1c84aeb984298fbb64ccf10156940667e45b981aedfdb5dfc0e
252 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains XFA (XML Forms Architecture) which is known to be used for embedding executable scripts. Heuristics indicate PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT, suggesting the XFA form contains exploit code. ClamAV detection as Win.Exploit.JS-296 further confirms its malicious nature. The primary attack vector appears to be exploitation of a client-side vulnerability via embedded JavaScript within the XFA form.

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 9166 bytes
SHA-256: f7a838cecd8fe5eb0147d62bcc95cc593eb7d691d8848e7f7ec9786f63dfab29
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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