PDF malware analysis — malicious · 35b4577e6106686b

MALICIOUS

PDF

9.7 KB

MD5: a8155010593c41182a93c09b306f26e8 SHA-1: ad8203a98d807366fa3543ef5a49814d7d5c6fcd SHA-256: 35b4577e6106686b6864049d1eed9ca57c19b787b34f48decfff3cb0965f76dd

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is heavily obfuscated but appears designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files further indicates a multi-stage attack. Due to the obfuscation and lack of specific indicators, the exact family remains unknown.

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` `d2233358777d1aaed8efae57eefbdc7f0ddc83b20eb36c734bc8ee388da7c061`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1418 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` `ecbd9120112266fe615fc3fb5673c1e935196180e0d32dd93603604e9cbe15e0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	11857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `0d245dba51ffdc60555d82a5681b34bb406e30f9ce712e3fe2ad20785c3264e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x440	4979 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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