PDF malware analysis — malicious · 27cd9ef70858b8d7

MALICIOUS

PDF

12.6 KB

MD5: 40cd2b57de692e4985e59f69dfe0df8f SHA-1: 71abd25bb0c4bb9f4007cc3c193326bb29324175 SHA-256: 27cd9ef70858b8d7b5c13634dcc48859c39391188893acd7476354d291d619b0

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability through the `collab.collectEmailInfo` method. This JavaScript is designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files further indicates a multi-stage attack. The exact URL for the second-stage payload could not be reconstructed from the provided evidence.

Heuristics 6

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 (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `64f9ab514099b25f83afb2d9b7fc39559b21e742d2fd2a22d7b3bc1893e6d5c3`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `a159f0d47ea64393be1f61406d1136f405031cdc7a9fda7a7da19f183e511428`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x305	12146 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2627926b503f2b41afa9a699c2f7fcc36e9ae55ff9266075813bf1a65ecfcd02`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x305	5071 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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