PDF / .TXT malware analysis — malicious · ad74f0294755be9c

MALICIOUS

PDF / .TXT

11.8 KB

MD5: b90bf99de4f19e09a9363888ad15d5c6 SHA-1: 8563b86880672d39d307581b9eaa71d0217d87eb SHA-256: ad74f0294755be9c14eb4738cffb4705db980efa3f5ed2fc58a63b23ceb1d189

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified by the CVE-2007-5659 heuristic, which is designed to exploit a vulnerability in older versions of Adobe Reader. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', indicate a multi-stage attack. The primary function of the script appears to be downloading and executing a second-stage payload from a remote source, leveraging the 'Collab.collectEmailInfo' JavaScript sink for exploitation.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `92f78baff6173d456730afcea39d3ab3a345f6b6bcf202d6e4bbc24a7b69e352`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	4984 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `1f1aa5e8a822d7f21d953666a23d4f396f82b8919d8544602aac47b6dde4380b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	11953 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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