Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdbb2fba157d7dd…

MALICIOUS

PDF

7.7 KB Created: 2012-04-17 19:53:38
MD5: 886cb5edfa74672a9f0cb8098f042a4a SHA-1: 6ce8033d0e4626c92ad8b244a9dd66ef5a364b58 SHA-256: 4fdbb2fba157d7dd278f3bf58892111c32560b2f8144dea562960fbffc1805e5
98 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample is identified as malicious by ClamAV with the signature Pdf.Exploit.Dropped-156969-1, indicating it exploits a known PDF vulnerability. Static analysis revealed an embedded script payload and an embedded file, both common techniques for delivering secondary malware. The document body contains obfuscated text, further suggesting an attempt to hide malicious content.

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
18fed6454b834644c045cb96e95bf00db37ea06aeeadcbf3b73a2b91648551c0
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).