PDF malware analysis — malicious · fb6b68325e97c2cf

MALICIOUS

PDF

13.2 KB

MD5: fc412d53bd5ef3f1c38f88bc61525a4b SHA-1: 476d8f408ade54101f978d5830e343af3c678232 SHA-256: fb6b68325e97c2cf4106505fda5c09b20f393ad361209b9a7f4f7cbc93647dd8

78 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. This script is designed to deobfuscate and execute further stages, indicated by the extracted JavaScript files legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The primary function appears to be downloading and executing a second-stage payload.

Heuristics 4

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.
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_obj0007_000.js` `bedd676af9bf2e3ca07f9e3a10d07bc561e9745801f30653ef176c0c1e7620a3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	336 bytes
`legacy_pdfkit_stage_000.js` `c1163f41c9ae35c162c8f5436247da2d6cadd6d64d5d1cfa27bd046b0cc302ad`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	12296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2730d8d77f8ee7e33861609eadf9088543213c42fa2f289b54b8d45c7e3353ac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2EC	5092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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