Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b67601956c80613…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: bf81c45ef971fee4dc08b9df9afccc9d SHA-1: fa576612637ca6cc52a05be690d3ab9e9b0a2b35 SHA-256: 8b67601956c806132c74a2f04f34187ba4ad05ba631653e6cca4085aa873b522
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The file is a PDF document identified by ClamAV as Pdf.Exploit.Agent-36874, indicating a known exploit. The presence of an XFA form and an AcroForm button with an action trigger further suggests malicious intent within the PDF structure. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves exploiting a PDF viewer vulnerability to achieve arbitrary code execution.

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
c1154d8aa5ef07d503299e5532091a1c72e52e63228834e2f87345d9252d5957
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1439 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).