Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5496300e169d959…

MALICIOUS

PDF

16.5 KB Created: 2010-08-29 16:19:36 Authoring application: styeZek colSnap
MD5: 0a545cd43747835053ee8df6ac63dae9 SHA-1: 9a63cfe7d5ccddf046dd8601119a4baae5e913f7 SHA-256: a5496300e169d959de2b9cefe438c61c22ae5db9a4ca6366d8faf59e2cb5de49
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by ClamAV as 'Pdf.Exploit.Dropped-81' and a machine learning classifier assigned a high probability of maliciousness. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it is designed to drop and execute a secondary payload. The ML classifier and ClamAV detection strongly support a malicious exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • 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 0xD7 67 bytes
embedded_file_obj0009.bin
e2e0f6c5cb2e0b2697da89386bfc3718eedaf1b6a2b1d24dd1176d27117bf77a		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 781 bytes
embedded_file_obj0010.bin
45c6313a70c534019cc5824825e927269c8e9e5955559ca35419268e1686932d		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x4BA 81 bytes
embedded_file_obj0011.bin
b468c4493a856b91ae54087ab9e3fb9eec7a78ea38880c020d935ceb77d9a752		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x556 13872 bytes
embedded_file_obj0012.bin
103d1e7983cf88bfacedddb4af33ffb5317d9c2c8b3e1bfd987b2c5d712bc985		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x3BD1 323 bytes
embedded_file_obj0014.bin
9342db065cdcaf52cc1c03a167a9ee6da4adf7b601ac8728eb048874abd6ddf7		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x3D5E 161 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 0x3E45 77 bytes
embedded_file_obj0016.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x3ED9 68 bytes

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