Malicious PDF — malware analysis report

Static analysis result for SHA-256 675c1e0738b30060…

MALICIOUS

PDF

12.8 KB Created: 2010-11-18 11:59:46 Authoring application: adz aal
MD5: 4d2534f4ef8dcf3fa7a8f0c29fcdb389 SHA-1: c7f6b201cfb96e0224620afff468339e60af0d2e SHA-256: 675c1e0738b30060d997a5feddc3475a9c16dbdcf6e950c2dd6e8106c6a3eec7
198 Risk Score

Malware Insights

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

The PDF contains XFA forms and embedded scripts, flagged by heuristics as risky and malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a dropper for a secondary payload. The presence of an embedded file and script payload points towards an exploitation attempt to download and execute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • 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: Pdf.Dropper.Agent-7268434-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7268434-0
  • 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.
  • 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_obj0005.bin
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0xA1B 84 bytes
embedded_file_obj0013.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 13 at offset 0xACD 228 bytes
embedded_file_obj0014.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0xBBE 199 bytes
embedded_file_obj0010.bin
93db9443d0d99cbb4f39241e02b1024673cbb6cc8000778908611a67736dbdcb		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0xCAF 119 bytes
embedded_file_obj0008.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD65 77 bytes
embedded_file_obj0009.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0xE0B 56 bytes
embedded_file_obj0004.bin
2d13981c6b122d091017d7c062996551461db2f362605abe29874a82a282ce9c		 pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1147 12836 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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