Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b79452dec2f6e2a…

MALICIOUS

PDF

12.1 KB Created: 2011-04-17 20:16:26 Authoring application: eta nae
MD5: 84ab39d19c4f78470c9cce63f693107f SHA-1: c7c2e3218a3fd38ec75ff8bf6c05035def34d38e SHA-256: 6b79452dec2f6e2a9f7005a2c235b83c13918983e1d23eb8a5fea8757b6febb1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains high-severity heuristics indicating the presence of eval() and unescape() calls within an XFA form, strongly suggesting embedded JavaScript is used for malicious purposes. The ML classifier also flagged this PDF as highly malicious. The embedded file 'embedded_file_obj0013.bin' is likely the secondary payload. The document body text is obfuscated and does not provide clear user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 low 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-template/2.5/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0003.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x1239 84 bytes
embedded_file_obj0005.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x12EA 228 bytes
embedded_file_obj0018.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x13DB 199 bytes
embedded_file_obj0017.bin
3028a83799fbeb61ac2800d74d4856ea4a1881d183b1a7585c95ad2458fdecc2		 pdf-embedded-file PDF EmbeddedFile object 17 at offset 0x14CD 154 bytes
embedded_file_obj0012.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x159F 77 bytes
embedded_file_obj0015.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x1646 56 bytes
embedded_file_obj0013.bin
776f11d194bfd1592a20d7f493a03ec5000ef9cfd1a140a87519c9e53523b805		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0x19C2 19854 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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