Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d48f0fff9f6c70…

MALICIOUS

PDF

4.5 KB Created: 2008-31-20 53:85:00 Authoring application: 1994 (via 1994 2.2)
MD5: 6c277398d830e2168af7cea29b5a2508 SHA-1: e9086edcb78dde7e394ead34f82e7198276dee03 SHA-256: d9d48f0fff9f6c70cff7158224476f6048b9aceb3db18ece9c8bf5b72d3e6242
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_UNESCAPE rules strongly suggests that the JavaScript code is obfuscated and uses eval() to execute it. This obfuscated script, named 'javascript_obj0013_001.js', is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery. The confidence is slightly reduced due to the inability to reconstruct the exact payload URL or execution command from the provided evidence.

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_001.js
34b254b4ab1d922101c38717792bfc30fe8c8747fc5325d843b41fd8e8cb711a
pdf-javascript-stream PDF /JS object 13 at offset 0x3D4 70178 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).