Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad85347916e919d9…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 9a1d87e6b65c9ea73e06afdba701399b SHA-1: afbe2b4e6b1e4e2c62d5d4f6c549a6a09dd54f54 SHA-256: ad85347916e919d97e2317d0c8c572f92e5fdcc92bfa7fc7897f533791bda3d3
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution

The file is a PDF document identified as malicious by ClamAV (Pdf.Exploit.Agent-36874) and a machine learning classifier. It contains an XFA form and an AcroForm button with an action trigger, suggesting an attempt to interact with the user to initiate an exploit. An embedded, decompressed PDF stream was also flagged as suspicious. The document body contains obfuscated text, providing no clear lure.

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
b467d497e23ef4f0dd7d5bc548869a10f195da6e70515c3d57c27cfa985aa57d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1455 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).