Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d04f0f5607bc48…

MALICIOUS

PDF

25.6 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: f33fd9a79d97f7d1e91d49854862da03 SHA-1: 28c6008d0e5787ec1f3cc6bdf31ee0a6b3c3a44d SHA-256: 72d04f0f5607bc48fc4ec1b4c9aee8f886d5a6cd9fac850272b948f1731bc4cd
158 Risk Score

Malware Insights

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

The PDF file contains XFA forms with embedded JavaScript, flagged by multiple heuristics as malicious and triggering a critical ClamAV detection for a dropped exploit. The embedded script is likely responsible for downloading and executing a secondary payload, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings. The presence of embedded files, specifically 'embedded_file_obj0011.bin' and 'embedded_file_obj0014.bin', further supports the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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://www.xfa.org/schema/xfa-template/2.5/
    • 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/

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xDB 67 bytes
embedded_file_obj0009.bin
6b2260d3c78649345d3f0b850b831d545d33bb7017ccdf438cdfe1e9db7f2db2		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x167 294 bytes
embedded_file_obj0010.bin
32735645b64751b47cc4a1d4a02dd207fd8fa9ea25a78fb5bd5dda9b4c9d8a68		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x2D8 502 bytes
embedded_file_obj0011.bin
4c6fd5cfb736dc17882318d3286318a6de447e6784ce91bb5be9723eee3c7b63		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x519 23049 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x5F6D 323 bytes
embedded_file_obj0014.bin
6a34b324794c506fbd6dbfa05a2e584bfc5348352bd53c09255137659edd58cc		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x60FA 165 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0015.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0x61E5 77 bytes
embedded_file_obj0016.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x6279 56 bytes

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