Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb89525fce50698e…

MALICIOUS

PDF

26.7 KB Created: 2006-02-01 14:14:12 Authoring application: Wegoptyr (via HghTc6Fs)
MD5: 26a360e37812e6d5ccf31ed06ce692d9 SHA-1: 635fa4ca8960b9a4fd4ce36cb8dbf4d6e1f7f96d SHA-256: eb89525fce50698e152f4f7fc8eeeb678980536961f9c1abe15c619935b62e6c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript that utilizes eval() to deobfuscate and execute code. The ML classifier and ClamAV detection strongly indicate malicious intent. The JavaScript appears to be responsible for downloading and executing a second-stage payload, as suggested by the 'Pdf.Dropper.Agent-7320096-0' ClamAV detection name. The obfuscated JavaScript makes it difficult to reconstruct the exact download URL or execution command.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7320096-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7320096-0
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
048dc9605de6221fba5e1feab19d5d7e4dc0bfcea5f0351452a71850f5f1369c
pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 26237 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0007_001.js
7bf758e57d91eb246a4cdf2ada599a7dac7b4a04687438507af7781d3e11eebe
pdf-javascript-stream PDF /JS object 7 at offset 0x1EE 441 bytes