PDF malware analysis — malicious · 23d936a4e014a186

MALICIOUS

PDF

19.5 KB

MD5: 0e4116d4b76295884884e585b05b0035 SHA-1: d1f4b2431003e3b0b946baa1bfbc844973ee6d58 SHA-256: 23d936a4e014a186493dd4ef6584e8f8ccb197d0b5abe78badcb4600cae32e77

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'unescape()' to deobfuscate and execute malicious code. The critical heuristic 'CVE_2009_0927' specifically indicates the use of the Collab.getIcon method, a known exploit vector for this CVE. The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the deobfuscated JavaScript stages. The attack pattern is consistent with exploiting known vulnerabilities in PDF readers to achieve arbitrary code execution.

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` `931d1f6a7b0150270cb439446b7c8d538d08a701ca42ed353028f7b2cea00ef3`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3064 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).
`javascript_obj111712_001.js` `1f2e51ba89ee78e35e16d8761d97104ea1c3493d5b8a555f7c11396db442d45a`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xDBC	14668 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` `b8e19ae64b094370d2ebe5e9cbb1c71634e4d6d2e815cf8755da5caad2fd3e8c`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x473E	1676 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` `4fd3b362d8a2a6f4a6ca7a013b1ab992f9e4b33f1a29e0d730e631ddbdc1ab8d`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xDBC	1524 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` `ffb10b295c62b32f99048b741cab9ab4b2185c9018be06834c141bc0b29cefbc`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x473E	103 bytes
`legacy_pdfkit_stage_002.js` `a1dbb9bd60f61873b692cfe2bb792a32d61393143f8ee950028c87074a90011b`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xDBC	1628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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