PDF malware analysis — malicious · f1f4b28124e42bef

MALICIOUS

PDF

23.4 KB

MD5: 83ec7ffbeea9c0b5113f8f7fa66d1918 SHA-1: 36565df778335b43dd6435d44dc2007809b7f612 SHA-256: f1f4b28124e42bef02c8d4ecbc33fe319473f75fbd53b9d027322c3f4b87c9f4

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

This PDF document contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a critical CVE_2008_2992 alert. The JavaScript utilizes eval() and unescape() functions, along with string concatenation, to hide its true functionality. The primary intent appears to be the execution of a second-stage payload, as suggested by the 'eval()' calls and the presence of deobfuscated JavaScript stages. The CVE-2008-2992 exploit is a known method for achieving arbitrary JavaScript execution within PDF documents.

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` `d368ede18658c9a0df6bfebb5c9477e8b85f32552768f060f26e2cc74cb13176`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3430 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_obj111712_001.js` `9827c8327a097d92511698060cf222493a170e31755615fe34883e4f9b3a21f1`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF2A	15357 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_obj111713_002.js` `273a006f44c25c20eaa16c87820da801726b82dc576826e385476cf55fbda1c6`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4B5D	4624 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).
`legacy_pdfkit_stage_000.js` `442614b743ce568cc27991fb1560c18026c97bd3239bf08032085dc9a3223bbe`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF2A	1421 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` `df2e8f38acbcede11c3621c62802a425613ee3b105933e1debbf6452a55bb89f`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4B5D	384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_002.js` `e66cb81f6437a00acf6a9cd5fd6c9835d1ae7a393b7a57e66742b32d090bb3b2`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF2A	1806 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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