PDF malware analysis — malicious · c04faeb6ca61d58d

MALICIOUS

PDF

12.9 KB

MD5: d328fb23bbf2e56934da79575d9ba56f SHA-1: b1f56bf0bad62bb26d1ba333ea0449db2ceffa3f SHA-256: c04faeb6ca61d58d94119b8f1e8412100050fac85f0e7e67a311363804cd01aa

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.001 Malicious Execution: User Execution of Malicious File T1204.002 Malicious Execution: User Execution of Malicious Code

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This vulnerability allows for the execution of arbitrary JavaScript, which is likely used to download and execute a second-stage payload. The obfuscated JavaScript streams and the critical heuristic firing strongly indicate malicious intent.

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` `9a7e04767bd41e3085db3b13eacbf13f5c4f2401073f7bafc9a2a0bc48c924a8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x43B	12175 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `f8f4a3890d932638294af2131cbea6e5c172d0156c4467ff9862d9e02eecf052`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x43B	5029 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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