Malicious PDF — malware analysis report

Static analysis result for SHA-256 d789b0643b940f0a…

MALICIOUS

PDF

136.8 KB Created: 2011-09-08 05:03:17 Authoring application: FPDF 1.6
MD5: 1e0a3182fbaa05a0d283cb2aecc9a028 SHA-1: f1c9e9f15215e6db46d5093254923bf76ceee3d6 SHA-256: d789b0643b940f0a210459f2b8690729204b3398176ceadb9c4991b8527eadcf
108 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Agent-36874. ML classification also strongly indicates maliciousness. The presence of XFA forms and AcroForm buttons with action triggers are common characteristics of malicious PDFs designed to exploit vulnerabilities. The ML classifier output of 0.999296 further supports the high likelihood of malicious intent, likely involving exploit delivery.

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
93fecfaee452f7b060c6dc062026fbb77e430b2a958f00aaee9bde5aea14708b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8ED 1435 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).