Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ae3564f661a8b2…

MALICIOUS

PDF

46.6 KB
MD5: e700651e7db289da05b0adb787fda1d5 SHA-1: 3942e57b1a0ed1406ee81c9def3a867ba488ddb5 SHA-256: 90ae3564f661a8b2155eb8cd81dd1d174583ca30477eb278c5d4da4449b746de
78 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2008_2992' alert suggests exploitation of a known vulnerability using JavaScript that is constructed by concatenating PDF metadata fields. The deobfuscated JavaScript file 'legacy_pdfkit_stage_000.js' was extracted, and while its exact function is not fully detailed in the provided evidence, the presence of exploit-related heuristics strongly suggests it's designed to download and execute a secondary payload. The file's SHA256 hash is included as a primary IOC.

Heuristics 4

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • 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_obj0008_000.js
0888c3618a24e71f4fbaee101abf5352b26f0fc0d3bdf0b2af341dc0da0fc912		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1177 bytes
legacy_pdfkit_stage_000.js
ee60258182feb41d826258788828bd822afb0de3e3a3bef75b7e65ed43875b6b		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x6B4 3047 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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