PDF malware analysis — malicious · 9b13a2393db0075a

MALICIOUS

PDF

22.3 KB

MD5: 680e1c16ac5dbfae1ed8d7fbf89b29a8 SHA-1: ecab17d121af243d6a8eb25b204bd89d498b0301 SHA-256: 9b13a2393db0075ae41a8a76423a5496728d457aa9579be2e2138866a5ef5728

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript, with critical heuristics indicating the use of `eval()` and `Collab.collectEmailInfo` to trigger CVE-2007-5659. The JavaScript appears to be obfuscated and uses string concatenation to construct its payload, which is typical for exploit kits attempting to download and execute further malicious content. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack.

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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `ac5577f29a24768ab665bba21aedd919319208256431f93f016334a4bdc0019a`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3897 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).
`javascript_obj111712_001.js` `76739a7be459be1eb923ea6e762e0155648e303f9eea38a31369d8f0f87a61c6`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x10FD	16865 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).
`javascript_obj111713_002.js` `0453d4ef2e504abb40f61d2e1fdbfd4ae516586085f4755bcb257998beef45eb`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5314	1485 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` `00daed73e706372f4569a0c27d68cbe2181f9151d6d2d3822f0e150bb6d48969`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x18E	3697 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).
`legacy_pdfkit_stage_001.js` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x10FD	1469 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `5909d3fcbda19722a52caebc0771ab221bf14fb296d8e53993773a839da2a146`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5314	84 bytes
`legacy_pdfkit_stage_003.js` `d1ed5066e50c13ad733d425241f0f8b625cf742cbf6580f3eb784ba20906cbc7`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x10FD	1554 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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