PDF malware analysis — malicious · 91a057d79ea2f586

MALICIOUS

PDF

21.2 KB

MD5: 7e77baca68c77aa2233adbc873d20e05 SHA-1: 953e1431becdab853e9b47e76c69cf6c34de6a52 SHA-256: 91a057d79ea2f586ec680714f4b47b509f67e328b5108ee7ebdb13423c1dca44

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains multiple embedded JavaScript streams, with a critical heuristic firing for CVE-2009-0927 (Collab.getIcon). The JavaScript utilizes eval() and unescape() functions, indicating obfuscation to hide malicious code. The primary intent appears to be the execution of arbitrary JavaScript, likely to download and execute a secondary payload. The obfuscated nature of the script and the use of known exploit vectors suggest a downloader or initial access stage.

Heuristics 5

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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` `94356e80bce9f74c96688f30c6a17cc660708b62f3f1b97deaad499c3fcf8fa3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3271 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` `b1f9ef76d5724c1ca937a10eb5382c0f64db3e223fc2c99abefc560c3abf3c66`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE8B	15936 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` `8e18c4c80fa5df476733a0b57581905e57ae63054875c24f2356f11ab66e3c15`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4D01	1914 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` `a7bf9e8f3472d8e456111af54d3cbfd9bd06c7e59489254ed4481e1c4d057ace`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE8B	1520 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` `407624ceb11bdfcccd03817d5cc6229f3a3f8dfc15051e1567d07f2b81bcede8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4D01	100 bytes
`legacy_pdfkit_stage_002.js` `92e6ee68583a1f8f3f57b7113704f5feacdadcb4c857a5c511ee3e5a12f9f3cd`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE8B	1621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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