Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9b077eab2cd594…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 245cd044b060a7cf403e6c0fea91bf35 SHA-1: f37b9584e27257a985592d48a360c3728fc630a6 SHA-256: fa9b077eab2cd5945da9c3b6a92161bbddbf40b8dca47f7bf3011869ecde9424
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as Pdf.Exploit.Agent-36874. The presence of XFA forms and AcroForm buttons suggests an attempt to embed executable content or exploit user interaction. While no specific script was extracted, the ML classifier's high confidence and the ClamAV detection strongly indicate an exploit delivery mechanism within the PDF structure.

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
bcab851814cea828d9c930d4fe951ecf05de54df0730b8921691cf5d8cd05770
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1497 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).