PDF / .TXT malware analysis — malicious · 231fb1992cf4c517

MALICIOUS

PDF / .TXT

12.0 KB

MD5: b7811393e7ad1b7e8886adc0eff1c5df SHA-1: 64988043bd04447cc68c591db6e2730da3702f9e SHA-256: 231fb1992cf4c517624f5f9da55d0a242005a8b2040a56a96df84ed2e88fa1a4

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, identified by heuristics as exploiting CVE-2007-5659 via the Collab.collectEmailInfo function. This JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the extracted JavaScript files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The presence of these deobfuscated scripts strongly suggests a malicious intent to compromise the user's system.

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` `9829461a0c0f112e35c2b2e64895ec239b792a1952340959f236174522eeb9c3`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5058 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` `eb80a3d1e6e8c780c4c13d651e743ae60807b3934650fb5f8112679c9736e52d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12176 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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