Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad08699a10e12df…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 027224c0c5de7d571fe85663b3af62f3 SHA-1: daed601b388d632b0f28f759d4a66e58ef136317 SHA-256: 4ad08699a10e12dfb9ffd223ef08d34bf761880469b3a841f5908f8e272ab12c
108 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic firings strongly indicate this PDF is malicious, specifically detecting it as Pdf.Exploit.Agent-36874. The presence of an XFA form and an AcroForm button with an action trigger suggests an attempt to exploit PDF vulnerabilities. No scripts were extracted, but the file's structure and heuristic detections point to a classic exploit delivery mechanism.

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
8ab546c38952744c25f5dc453601d8e74161de378b9820deda35e310cfa8ab22
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1448 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).