PDF malware analysis — malicious · db40a2c61adddede

MALICIOUS

PDF

19.6 KB

MD5: e4c335c43b08e9d673132176d3c9db8a SHA-1: 8825061ce35b4ffb7a8a26751d715ae53e92cff6 SHA-256: db40a2c61adddeded37caff44c83ce5bc1652be65e1b6d2400ab5cb941cba594

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that utilizes the eval() function and the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute malicious code. The deobfuscated JavaScript indicates that it is designed to download and execute a second-stage payload. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics confirm the presence of exploit-related JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `4ffb77e543f267eb46d450dd763bfb26305f058f87b6503f73f18d4e5764de5c`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3743 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` `8401df07e4a9ea6d27a30405274ce9aebf4f160054e51391f8a0a5f04861bf86`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x1063	14231 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` `b9c825abbc1281a33f146d66bbc755ffa9135c2bb563d549a9e4d8d33ab347a9`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x4830	1521 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_000.js` `3ce2f209b540fb36eed49cc31ae3f37f7cea4ebc079e3cbb3b999b83a97c1eae`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x1063	1469 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 0x4830	80 bytes
`legacy_pdfkit_stage_002.js` `357b3200f25aaa0f94477e46efe5cd9b025ae985d617a68221987ce815de1da4`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0x1063	1550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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