PDF malware analysis — malicious · a80970821e475a6a

MALICIOUS

PDF

23.0 KB

MD5: 4761c4e1337d1622033bf53db8bac94c SHA-1: 74f8f9754c2b61225e8ee904fa32f5eb24a0f93c SHA-256: a80970821e475a6ab1e1a7d4877a87126e2761ee73d7da7a13b746404b450f8c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1071.001 Web Protocols

The PDF sample contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2009_0927 heuristic specifically identifies the use of Collab.getIcon with a multi-marker percent-array encoding, a known technique for exploiting this CVE. The embedded JavaScript, particularly the deobfuscated stages, likely facilitates the download and execution of a secondary payload. The reconstructed string 'eval' is used multiple times, indicating dynamic 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` `6b2b6b4a829fd1a1f1e9e6d325c49702032c1b2a434ab194d148082bc218301e`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3385 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` `c58bb2971094342a447506a2919092238acc5d889a1ef97671d410214db4dea7`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xEFD	17790 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` `648d512ab55e336d86d6a1d11de53c4c3ef92c382b97e8107c002ad5ced82ee9`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x54B1	1737 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` `f89df567ac1524aa97d7d1c2e318640fc4fa1525d608905c9904da2f1b756863`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xEFD	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` `e3010f7d6c3cf09749d85060caef0bef39747d5e2013845c8284c3ea979bdce8`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x54B1	106 bytes
`legacy_pdfkit_stage_002.js` `567f0582aa6cb99ce7387407b487c643a5eb51efae9584903948cd774e9c31c6`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xEFD	1627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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