PDF malware analysis — malicious · 4ca0a045b6bf6b03

MALICIOUS

PDF

11.7 KB

MD5: 2d54a118bde3134d1d59e5580c7cf244 SHA-1: 9c8168e2291e93371c4abfa270ea1874e80da4dd SHA-256: 4ca0a045b6bf6b0319e5178b734b2b632c6c5e8f70e4d63b6237badf17634de9

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript Execution T1204.002 Malicious File: User Execution: Malicious Link

The PDF file contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS'. A critical heuristic, 'CVE_2007_5659', specifically points to the use of 'Collab.collectEmailInfo' for JavaScript execution, indicating a known exploit vector. The file was also flagged by ClamAV as 'Pdf.Exploit.Agent-36065'. The embedded JavaScript, particularly the deobfuscated files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', likely facilitates the download and execution of a second-stage payload, although the exact mechanism is obscured.

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: Pdf.Exploit.Agent-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `2c184466e6dcfa04c6957a6fd1c9606ed957c23d0608a709affc969579b98f8a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11898 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `3c26ed8655435ed4de828deae51347e441060f611af28079fc2833997e410bd6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4911 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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