PDF malware analysis — malicious · 50fb76e3806836f0

MALICIOUS

PDF

11.8 KB

MD5: e28cd1a7987659431d6d76a4d3c0af3a SHA-1: ff4887fcad4de07c8ecb4af3f523b3b317266ae0 SHA-256: 50fb76e3806836f01876b8affd9ee02965922efc21990b9c76977a394a3167c0

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified by multiple heuristics and ClamAV detection as malicious. Specifically, the CVE-2007-5659 heuristic indicates the use of a known exploit targeting the 'Collab.collectEmailInfo' function to execute JavaScript. This JavaScript is further deobfuscated into two files, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', suggesting a multi-stage attack. The primary intent appears to be the execution of arbitrary code via the PDF vulnerability.

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` `6d5f2e3a7b58134447de0d48ea3cc85f5ddda48b925bbe248e91b6461b57ca14`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11990 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `711e01921e9a3ef3ddf4a7f264523094fc838333f628b4dcefc05281cf490b5a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4982 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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