PDF malware analysis — malicious · fed784cd7951be62

MALICIOUS

PDF

21.0 KB

MD5: 7d72b727e8d7629d9b17eda60b65bc39 SHA-1: ef7b3ef851758bc4ee571b09dfdebd9562af366b SHA-256: fed784cd7951be621f9ead5a4539c444368f995ba62b7131569b193b37c99854

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 an attempt to obfuscate and execute malicious code. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability (Collab.collectEmailInfo) via a multi-marker percent-array encoded JavaScript. This suggests the primary goal is to download and execute a second-stage payload, likely leveraging the obfuscated JavaScript streams.

Heuristics 5

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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` `af449429132d2eee360a6117c1e4906b6531a0dfdbdbf84a1ad138a3fff7b316`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3851 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` `0c2c1e9556d266ce314e608f23bcdb15d226975f6c85f34fbb68d1914345dfe3`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10CF	15591 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` `6ff0ce1c3f289e8e267b9fed2574cd51e9b8c03d061346156055e78a7ce17d35`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4DEC	1448 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).
`legacy_pdfkit_stage_000.js` `84c1a03d56fba5ac383cb8b458d0180e4b99e61e1176a210b8e7ea21eb147218`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10CF	1490 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` `893b6a69a6b1f96ef94da875e2c6de5a6ab10d72b7676187c78f81073910b29c`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x4DEC	80 bytes
`legacy_pdfkit_stage_002.js` `68a04a2ec82e7dc0348ccdf029127741481559469bfc71fa90762ccb8a3e3444`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10CF	1571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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