Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f45d3e59436093…

MALICIOUS

PDF

25.5 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: cdec828eafe8d57fce67f5276863b86b SHA-1: b7d58b28e37421f690e67465a70c4de976bb54e9 SHA-256: d9f45d3e59436093ac5fcaa2f14481186043235a431330eebbb34b31ac63b768
208 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This PDF file was flagged as malicious by multiple heuristics, including PDF_EVAL and PDF_XFA_SCRIPT, and a critical ClamAV detection for Pdf.Exploit.Dropped-81. The presence of embedded files and XFA forms indicates an attempt to exploit vulnerabilities within the PDF reader. The ML classifier output of 0.999997 further supports the malicious nature of this file. The embedded script payload is likely responsible for downloading and executing a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • Embedded script payload in PDF stream medium 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.
  • 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
  • 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
1026affbe1251246da30b7dc26727cf389527a3a10accf510d4b257efa30be17		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x2D8 540 bytes
embedded_file_obj0011.bin
8b254a48b455638ba093fbea3d2e2f1bc513020ced4b310f22cf3ebed81c9f2f		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x53F 22881 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 0x5EEB 323 bytes
embedded_file_obj0014.bin
3275499da31d53b3a1c3d0d6c34dac803f5035cc26f0d36814d0b437d0e21cc5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x6078 166 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 0x6164 77 bytes
embedded_file_obj0016.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x61F8 56 bytes

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