PDF malware analysis — malicious · 9de55e8532869a21

MALICIOUS

PDF

12.8 KB

MD5: da22d78381bb8428d078c5d10f0bfc3a SHA-1: e4a0674167e26c8c42457356852afeb2a4dd94df SHA-256: 9de55e8532869a21e78e27aa9a4661ff5482edc019aece4297628bb301f934ab

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV and triggering critical heuristics related to CVE-2007-5659 (Collab.collectEmailInfo). The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', are indicative of a multi-stage exploit. The primary function of these scripts is to deobfuscate and execute further code, likely leading to the download and execution of a secondary payload. The attack pattern is consistent with exploiting known PDF vulnerabilities to deliver malware.

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `6b50b3dc2e5e5a59ac21b834a469c571b1964db4276d4352cccfb4f6e7f493f3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12582 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `cda1a68e85609387b5edda928b33b11ab78c8ccd39a83d74d0019fa841660c77`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5127 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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