Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61be92177011d2c…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: f2b0b060fc65990d019ffad941f40df0 SHA-1: 7b5052795e38ccd84425bc972d71be7dd82d0ae6 SHA-256: f61be92177011d2c83d0a06c3e64d8e1e53bbdd31a3ecf98f892fee783f32809
108 Risk Score

Malware Insights

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

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The PDF contains an XFA form and an AcroForm button with an action trigger, common elements in exploit-laden PDFs. The embedded artifact 'stream_001_off000008ed.bin' is a suspicious decompressed PDF stream, likely containing the exploit code. The ClamAV signature 'Pdf.Exploit.Agent-36874' suggests a known exploit targeting PDF vulnerabilities.

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
87a68709460cfa32cfa8caeced83a87add47589916a8dfe18341bfc5949f4160
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1382 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).