PDF malware analysis — malicious · 90d1234c750b90d3

MALICIOUS

PDF

22.9 KB

MD5: 16b2549675c7fa114cf309a30494a240 SHA-1: fa056d288e3964cebd41a30f85104c318b13a7a2 SHA-256: 90d1234c750b90d3bee5db490b3f0572e2049e91a0b81c7d1bde286e6ec362bb

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation. The critical heuristic firing for CVE-2009-0927 (Collab.getIcon) confirms the exploitation of a known Adobe Reader vulnerability. The embedded JavaScript is designed to download and execute a second-stage payload, as evidenced by the obfuscated code and the heuristic's description of encoded stages. The presence of multiple extracted JavaScript files further supports this.

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` `da94c3415a793e8a28c9c58c641ec015153c5dbfa8199aed25826223d0af1122`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3754 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` `9ee9e979678aaf09f5353dccb4b3a39ec76024bc3b0a98c38abe313f0dc7e2cc`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x106E	17365 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` `cadb1e9bdb0cb0e854af6e694e8e7c9d709aebac9aabcb7d73dce6690ab2a3a5`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5479	1762 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` `1412a09b263e0a64c28cc7f184247102cbe88e4b5ed6b84ed0c0c83087aaa08b`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x106E	1521 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 0x5479	99 bytes
`legacy_pdfkit_stage_002.js` `304d67ac207b77af4308fc097efd95ccd42eb93a9afaa0a93566636fc003e284`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x106E	1621 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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