PDF malware analysis — malicious · 43b8b4c93a744c0e

MALICIOUS

PDF

20.5 KB

MD5: a3ccb4041e0fd71553f39714363770bb SHA-1: e9f9f6232076154514eb4b8a252a3c23ac40a5a0 SHA-256: 43b8b4c93a744c0e2676e502945e742375e3f84e94a1acecfc59c032ecfde235

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation and dynamic code execution. The critical heuristic firing for CVE-2009-0927 specifically points to the use of the Collab.getIcon method to trigger an exploit. The deobfuscated JavaScript streams suggest the script's purpose is to download and execute a secondary payload, a common technique for initial access.

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` `edd5e830f0fdd27b973cca8a68a2dc21c2c00416e601aae7aacdd5d9d6c2c781`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3496 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` `14a15b719670e6a687bca4b938bc2d8bdc10439b772ae622c362df5f50690a3b`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xF6C	15313 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` `61e1f4f9e3019f9c0bc580d4ba60c69a05e456daeb91c528aa48d8c2b1ba4b0e`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4B73	1558 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` `fe7ca5c1028e68542211c360d30953a4ec2fc8a09167f68f2d8f910da3a437ca`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xF6C	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` `c962f69aa3411144ec0b205734fda95af64cd50cef3172631ec881d6425142db`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4B73	104 bytes
`legacy_pdfkit_stage_002.js` `4735ffc460051fcaf8fa997a79af269f5fc661944b9f7a1470bbd78789b73775`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xF6C	1625 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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