PDF malware analysis — malicious · e0efe3afc14523f7

MALICIOUS

PDF

25.5 KB

MD5: 55f9ea7c453687417ecd954eb5d62c34 SHA-1: b43cfffd762ce9f8d2b0401e99f611c029127e94 SHA-256: e0efe3afc14523f73113e587300a0dee54795d62a955a8f0349b5387b73d56f0

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, including multiple eval() calls and the use of util.printf with percent-encoded strings, indicative of exploit kit activity targeting CVE-2008-2992. The deobfuscated JavaScript streams suggest the primary function is to download and execute a secondary payload. The specific exploit trigger, CVE-2008-2992, is identified. No specific family could be confidently determined due to the generic nature of the exploit.

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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `90d7ed0d415bbd8d4eb0bf7ed03c83dbbdb010438c9f681f5af87ff8e13461ec`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3875 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` `280170863779da6ff4168c45ba55feeb5e4fa766a4b213358787f1b39419ac86`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10E7	17599 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` `c52c150d29c15176cce6feac7c581ee7a6db6be5b2fbbaf1772069b7f17855ef`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x55DC	4032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `1da6fb1ffadd0229780aa4b428cfecf864c90abd211d706ca62e4f9668b0d7a0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x10E7	16965 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `180355ea6c0b517e868d3e2bce2f1de00b1c1f27baeed48ae2a21c7b0cb77d22`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10E7	1418 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `e282e90aa5eca950df2ca38b720cea9e6025f175e744e4f996f2c8820ba8b08c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x55DC	385 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_003.js` `fe0a32d5ae757d0cab6ef32e09bf8f26806c0e8fa1cf514e6ef33155bc82d39d`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10E7	1804 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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