PDF malware analysis — malicious · 25ef2ee1487f50b3

MALICIOUS

PDF

24.5 KB

MD5: 264a99f52707638aab7a9a5ff5601775 SHA-1: 74a23e76ad1bc67d0c686e9a21b5b96b458fb2d4 SHA-256: 25ef2ee1487f50b3ba25cc9b7ec2d67c59ea77b1d43e0fd5a78db6d812a96ad8

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that utilizes eval() and unescape() functions, indicative of malicious intent. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known vulnerability in Adobe Reader. The embedded JavaScript is designed to download and execute a second-stage payload, as suggested by the obfuscated code and extracted JavaScript files. The reconstructed string "v"+"ar "+"WkT1504jb"+" ="+" e"+"v"+"a"+"l; v"+"ar"+" ZnpWRO "+=" u"+"nes"+"cap"+"e;"+"va"+"r "+"sY2uNV60Y "+=" S"+"tr"+"in"+"g;" is a clear indicator of obfuscation used to hide the execution of the eval function.

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `0578ce1130b53f0e10acca8d616749373880f9f4d3553137cbd8e6c5cf0b4a4e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3974 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`javascript_obj111712_001.js` `e28ed6740fef12f45d746df4bae816a4d2e92276a8c3796fd2bba0f6a845ad1f`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x114A	16312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`javascript_obj111713_002.js` `0b4cda54e06900a11d4d724df83e5d509ecaa5fc5c1e600bea6e42f14ec6b91b`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5138	4223 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `510ef7d0d9142d7dc5c1f46bcecda08ecb82a047f857ab85a6dfcf12080ae76f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x114A	1417 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `cd3547282590e3f89fc1058335c6dff0bfd5929c89037ba994d2b366f7d3a7f8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5138	387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `1df66f0c9d275cd915fb8a494b77e57d22445434211652a65673c8bab491a46c`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x114A	1805 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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