Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e64841c8a139223…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: ae234538675e5e83ff61c43dddb2de97 SHA-1: 1e365fcd654e207a74b15142fe99b077862620d2 SHA-256: 9e64841c8a139223e8372fe13d65c53d4f4c2252bea07744781e0db2f4993ab4
108 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classification and ClamAV, with a specific detection name of Pdf.Exploit.Agent-36874. The presence of XFA forms and AcroForm buttons with action triggers suggests an exploit is embedded within the PDF structure. The ML classifier's high confidence score further supports the malicious nature of the file, likely intended to exploit 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
87fec4159255a508cfa33816b3e9468695d47cfc1d666362e50ea6a72a202d63
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1429 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).