Malicious PDF — malware analysis report

Static analysis result for SHA-256 347cd6c3d143555f…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: b97f8d4ec0daf1c2f70f22219d9922b9 SHA-1: 8cc51998a45ace913c18bc0a65a04cbce1a61c66 SHA-256: 347cd6c3d143555f69991e9965800ef716ef90b2f445152096a6757aaf089819
108 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically detecting 'Pdf.Exploit.Agent-36874'. The presence of XFA forms and AcroForm buttons with action triggers suggests an exploit is embedded within the PDF structure. While no specific script was extracted, the overall indicators point to a malicious PDF designed to exploit a vulnerability and likely deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36874 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36874
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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
stream_001_off000008ed.bin
67df535d15a90f49081c98f78a6ec2a4a7019032b1bb98a097e6452e8acba127
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1414 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).