Malicious PDF — malware analysis report

Static analysis result for SHA-256 4319bf55d9c3d256…

MALICIOUS

PDF

7.2 KB Created: 2012-04-21 19:58:55
MD5: 9ef461aacc894cf00ab6a54a20c75ed5 SHA-1: 449b707fdf602675d5559edfca5159a483735739 SHA-256: 4319bf55d9c3d2568eba9431f897e0f742698e50b8ea5fdaa22129074090cef0
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The file is identified as malicious by ClamAV with the signature 'Pdf.Exploit.Dropped-156969-1'. Static analysis also detected an embedded script payload within a PDF stream, indicating the document is designed to exploit a vulnerability and deliver a secondary malicious payload. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0006.bin
0084ce91967a9c1169bb6710a02f3415d4fc79c352e29dde80b15a70f28d2a95
pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x9D0 7172 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).