Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d3e6507c997f0…

MALICIOUS

PDF

2.3 KB
MD5: fae28eb7b3befb4bfb56d0f437675255 SHA-1: f735f837cdb13bb3e0dc14b1508790dd29b21fb8 SHA-256: 552d3e6507c997f05c843159d599515d943015e83bab0efe1582a183d5fa15da
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2008_2992 heuristic firing suggests exploitation of a known PDF vulnerability. The embedded JavaScript likely attempts to download and execute a second-stage payload, as suggested by the 'unescape()' call and the presence of multiple JavaScript streams. The specific exploit targeted is CVE-2008-2992.

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
b383efa54514a19000316822b31734450ba5f4636b28f9d095220eda5316412f		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 6920 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
366823a4e5153a202a31de96b06201690cf05c7fa4a7ac08247148c26a74b14e		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6B3 156 bytes
javascript_obj263986_002.js
c4a0be726c86ca5d2842bfc19f74206a4121e53fd42b06cc501b5253c20c9ac2		 pdf-javascript-stream PDF /JS object 263986 at offset 0x785 526 bytes

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