PDF malware analysis — malicious · fd3c1bd07be4a471

MALICIOUS

PDF

12.9 KB

MD5: efa99e080157df8eb52dca1fd6c549cb SHA-1: fcbb37d150e7ccc9339337265867fb6345552041 SHA-256: fd3c1bd07be4a471d5c6de105af5dc4a4c1ee578a06b19d13a8053e4cc0bb952

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. This JavaScript is designed to decode and execute further obfuscated code, likely to download and run a secondary payload. The presence of multiple deobfuscated JavaScript files further indicates a multi-stage infection process.

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)
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` `2a01b2293983f2367a69a6816eaba286b3f213dd1169183858d5f4fd61b4b22a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1383 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `a159f0d47ea64393be1f61406d1136f405031cdc7a9fda7a7da19f183e511428`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x43B	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 0x43B	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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