Malicious PDF — malware analysis report

Static analysis result for SHA-256 5336cea334ea62fa…

MALICIOUS

PDF

7.6 KB Created: 2012-04-17 19:53:38
MD5: 31226bd7707e31eca5dfe570809fec27 SHA-1: ebbfc83552bbe3c4c168c78f235bd4e764f6e449 SHA-256: 5336cea334ea62fa2cbe6a4c9a18d9243a77dcc3a3fc00a541dc76f3a9316cda
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.001 PowerShell

The critical ClamAV detection and high ML classifier score indicate maliciousness. The PDF contains an embedded script payload, which is a common technique for delivering second-stage malware. The embedded file, 'embedded_file_obj0008.bin', is likely the dropped payload. The XFA form and embedded file heuristics further support this. The document body text is heavily obfuscated and truncated, providing no clear user-facing lure.

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_obj0008.bin
79b4953807f25ccd2fe058b569111710110d49c67d5cd6a54e2f9dbde94ab5e5
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xBAF 7163 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 long base64-like blob(s).