PDF malware analysis — malicious · e3191bf1f23cbc77

MALICIOUS

PDF

11.8 KB

MD5: c1d7431dea589c0627d64d14dcacc04c SHA-1: fe7bf6619aca18b236c8d8c26a47fb388be49d30 SHA-256: e3191bf1f23cbc77e5ab9aefd1826d475d296e81a933dbcd31f2aff1e6d8e5a4

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is further deobfuscated into two separate files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The presence of these deobfuscated JavaScript files and the critical heuristic firings strongly indicate that the PDF is designed to exploit this vulnerability to download and execute a secondary payload.

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` `ac9c5cf624de6c44fba5b01a6b4accdf89b5786a3243b822f10ae715973452c2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11955 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `0e291cfead977323657fa4d75df6c6d9bd9408366df883b8151670a393b9ce13`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4951 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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