Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a6ac1cedb15cc6…

MALICIOUS

PDF

2.3 KB
MD5: c7aa4659a6cc7a8d67004858135f7b25 SHA-1: f9a9491ae8dccda30936387c9cf6f2a569be2109 SHA-256: 26a6ac1cedb15cc6e80044feb7454985d91840e95d8f5877d9103eff1c12effa
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the utilization of CVE-2008-2992 via a util.printf call within the JavaScript, suggesting exploitation of a known vulnerability. The JavaScript stream is further obfuscated, and a large encoded blob was identified. The primary intent appears to be the execution of arbitrary code, likely to download and run a second-stage payload, which is a common technique for initial access and further system compromise.

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
a6473e659fae107afc754637ec9c6dc1bc6c374de334619e989d0471a0d1c044		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 6953 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
javascript_obj263985_001.js
f0b3756a97921808032b022d4fe580e8da98ade70c9d9c546119966e83e15175		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6CB 153 bytes
javascript_obj263986_002.js
7ea1c4493f4de94daa01f9fbe86165dc6bcb60c56c2227d7ac989b5f85864f1f		 pdf-javascript-stream PDF /JS object 263986 at offset 0x79A 503 bytes

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