Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bde59047bb4d5e…

MALICIOUS

PDF

9.6 KB First seen: 2013-02-22
MD5: 5c9e91b2a5321cdb5a10a16356885862 SHA-1: a28a90862bdae301ad3714fa73f299b9587ac21a SHA-256: 92bde59047bb4d5ed7d205a79e19fe6b663eca68a3cbad910782ebfd988b0d86
74 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits multiple heuristic firings related to JavaScript and decoding filters, indicating a high likelihood of malicious intent. The embedded JavaScript stream, though not directly readable due to obfuscation, is a common vector for delivering exploits or malware. The presence of ASCIIHexDecode and ASCII85Decode filters further supports the possibility of obfuscated malicious code. The file's SHA256 hash is included as a primary indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low 1 related finding 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js pdf-javascript-stream PDF /JS object 12 at offset 0x3AD 8404 bytes
SHA-256: d303a57622d352c19f20c958ec4af134d7487d8fc981c878cd21ec5b83958539
Preview script
First 1,000 lines of the extracted script
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