PDF malware analysis — malicious · d105b38e5db7c952

MALICIOUS

PDF

20.4 KB

MD5: b6bb6f91b9d782d8fbb24c5ae85407fb SHA-1: 3f64b7a9b4cfaeadd0c7e58e7407c1b8135d1f8a SHA-256: d105b38e5db7c95263da5126408f56b6e1bcb1b352cfc44489b00dd532f70015

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that utilizes the Collab.getIcon function, a known indicator for the CVE-2009-0927 vulnerability. The JavaScript is heavily obfuscated, but static analysis indicates the use of eval() and unescape() functions, common in exploit kits. The primary intent appears to be the execution of further malicious code, likely a downloader for a second-stage payload, leveraging the identified CVE.

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` `eb3157e39b8e6233915e85f71faec40a4e796e1bb05789e7ac15ccab66793b8d`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3205 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` `5faffb381cf5b0f39fdcfc70a304bb293ab72d52727d9e7a649c1a685e05c341`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xE49	15239 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` `9ae2485bfd428fe07caa29130fbb352880b8da87ad3d5a78d734bad9cb512298`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4A06	1823 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 0xE49	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 0x4A06	99 bytes
`legacy_pdfkit_stage_002.js` `23e61808d60ab8d6a4291b291143c05d5d659a2feab69d3280eff3b41d027417`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xE49	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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