Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6ab2354b438c01…

MALICIOUS

PDF

7.8 KB Created: 2012-04-06 19:15:32
MD5: b596ee8890369f10ca440e2795cfa86e SHA-1: bac590fb3faacb00a787fd82e98f8c50a3b81844 SHA-256: 7d6ab2354b438c0121258a23f650b9de7e32621b781a6eb1f78a73a40dfa0829
118 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-156969-1' and an ML classifier indicating maliciousness. It contains an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities and deliver a secondary stage. The presence of an embedded file named 'embedded_file_obj0010.bin' is a key indicator of this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-156969-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-156969-1
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0010.bin
236602dfabd0c7e7e5783c21af35b89361ccc801d99f0be8bae5f917d0861b41		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0xC8A 6998 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).

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