PDF malware analysis — malicious · a514c30d064d50c7

MALICIOUS

PDF

22.5 KB

MD5: d76a0a668cd8fab5c7ace76b11868c14 SHA-1: 9dc0e08545c874096127a8427307dc4a806e04a9 SHA-256: a514c30d064d50c788bb6fed89140c6948569409620c5e66d014aab94475adf6

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval(), unescape(), and String() functions, indicating an attempt to obfuscate 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. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be the execution of a second-stage payload, likely downloaded from a remote source, though no specific URLs were extracted.

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` `3ee56cf80134121d0ebba5c3b2ca9410428de95670bb1169399377e56dc919ac`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x18E	3349 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` `21919f26e8b2bb8e7ce8b781b5e78198b9c9b1d9cb411b206fee8f88968b6347`	pdf-javascript-stream	PDF /JS object 111712 at offset 0xED9	17705 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` `64eb32f53d116df0149a572d7ba89cbadf54fd467c954ccc1764e666a93a78ee`	pdf-javascript-stream	PDF /JS object 111713 at offset 0x5438	1383 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` `2980c43bc87d5be7250b5a4723bf3bcd3c36cacd277bc6999297ca7fa121bf1e`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0xED9	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` `cc8d08b1e822763d1eaccea6cb38016523f6cb7b96283844ef3a309018f82719`	deobfuscated-js	multi-marker percent-array decoded JavaScript at offset 0x5438	84 bytes
`legacy_pdfkit_stage_002.js` `bc7410659a9b5033332f748a753f5e77db06f9a20bfeb5bcd1713a018fab95d2`	deobfuscated-js	multi-marker percent-array combined decoded JavaScript at offset 0xED9	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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