Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd31faa3cbc49bf2…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: bd32107d27d38c14ec9610f29ebb108c SHA-1: edfe92b20f9fd39f9b6b062a7983bd43c155e1c4 SHA-256: cd31faa3cbc49bf2b12687d54b175dd00e5704f9fc82396212a4e48b4dd49bd6
108 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874. Heuristics indicate the presence of XFA forms and an AcroForm button with an action trigger, suggesting an exploit is embedded. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text, and an embedded binary artifact was extracted, further supporting the exploit vector.

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
413756efa155aefc5901f648a5141924a5a54bafc0eebd65c08193db74954578
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1471 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).