Malicious PDF — malware analysis report

Static analysis result for SHA-256 2356abffc649a73a…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: d5ecab3b7f199325e8e32d3332cce8a3 SHA-1: 9b7162b7b29f3938c2841a2800424712044f1f84 SHA-256: 2356abffc649a73a0a63a27b20493b68180d20092e8be849ef93c7dcd48ca1e0
108 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Exploit.Agent-36874, and a machine learning classifier assigned a high probability of maliciousness. The presence of an XFA form and an AcroForm button with an action trigger are common indicators of PDF exploits. The ML classifier's high confidence suggests the PDF contains exploit code, likely targeting a vulnerability to download and execute a secondary 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
bbae25a3f5aec60967a9a89c2af653d59a7d9aed72e30a94a95145a1199ee104
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1443 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).