PDF malware analysis — malicious · b2c9b0e6d43dbd28

MALICIOUS

PDF

12.8 KB

MD5: f118e07390919bb60a3d3750bd8e904e SHA-1: bdd7a968843b2098cadb02ac32541d1ad8855c63 SHA-256: b2c9b0e6d43dbd2884a987fa86b5bfae2e560396b3c0f2e2fbd4764cb5dbfb64

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1204.002 Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files further supports this. The attack pattern is consistent with a PDF-based exploit delivering further malware.

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` `c5168c9c7313732de8e5587f5372869ffa5c26b5efa6e8ef2e982efd67c5b031`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x43B	11956 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `edfe25a152f504d65549abc62e7f08c3115e0b12a6cf6c1f22441f2a1b1fb548`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x43B	4968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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