Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8baaff7b23cc6e…

MALICIOUS

PDF

2.3 KB
MD5: 769c24360eab2be4175e368eb9e307e6 SHA-1: b6d8102979a4d7464099bfa9929256c1b3b20fc3 SHA-256: da8baaff7b23cc6eca3e474cb988a50d3a2f9220bfcfd16f9c493d498e7a54d4
118 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2008_2992 firing suggests exploitation of a vulnerability related to util.printf. The embedded JavaScript is likely responsible for executing malicious code, potentially downloading a second-stage payload. The lack of readable document body text prevents a more specific determination of the lure.

Heuristics 5

  • 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. (matched in decompressed 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj263984_000.js
cb14b5c43bf8f55015430f64bd9b839c888a2ac788f658b7a24df31577e3d97d		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 6926 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
javascript_obj263985_001.js
ad4f6fd7a93579478708bfafe41623fdb994f6cb4112c218d7a0d2d2d7831cb3		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6B2 157 bytes
javascript_obj263986_002.js
a2be8b087a63c022ed894949aca0d90d1a5da6a00019bbeb3b2fb99182150281		 pdf-javascript-stream PDF /JS object 263986 at offset 0x785 511 bytes

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