PDF malware analysis — malicious · b9b5107c23c769c8

MALICIOUS

PDF

21.8 KB

MD5: 14087af866eeb0e30dd893596a91afc5 SHA-1: ee93e8ed1794978c3032baae5028f5e648f162c2 SHA-256: b9b5107c23c769c82e006e6ed88ce479feeece94485a9358d3b1ff1de697fbd2

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript that utilizes eval() and unescape() functions, indicating an attempt to execute arbitrary code. The critical heuristic firing for CVE-2009-0927, specifically mentioning Collab.getIcon, confirms the exploitation of a known Adobe Reader vulnerability. The embedded JavaScript streams and deobfuscated scripts suggest the payload is designed to download and execute a second-stage exploit or malware. The reconstructed string literals within the obfuscated JavaScript, such as 'v'+'ar '+'ABL5R0nZS'+' ='+' e'+'v'+'a'+'l', point to the use of JavaScript for 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` `0243e8e96a51ef9ea98908b987495e6451f26ba8a235129df90d8cbac879214f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3142 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` `93e0b17b6a428c70c74cfb990731bd5fd05b96314471df54565fb6c5a6717da0`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE0A	16865 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_obj111713_002.js` `435e0b72afd161f2051fd8149b652cf25fa09aec3f5847d4e96599980634a857`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5021	1768 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` `fe7ca5c1028e68542211c360d30953a4ec2fc8a09167f68f2d8f910da3a437ca`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xE0A	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` `1397a77c63e5e8be02a059fd3c671fb708b92cb64d00ded4f2045e71093dec16`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5021	99 bytes
`legacy_pdfkit_stage_002.js` `23e61808d60ab8d6a4291b291143c05d5d659a2feab69d3280eff3b41d027417`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE0A	1620 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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