PDF malware analysis — malicious · 3224115878c6843b

MALICIOUS

PDF

12.0 KB

MD5: cddeb93f0bff50589fdb75aa2c1a6854 SHA-1: c074297a14199608a455aa519c72e206a58ddb94 SHA-256: 3224115878c6843bb4971d6e62ef26a9980898c6fbb6a0f3676bdb5901a54029

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 with the signature Pdf.Exploit.Agent-36065. Heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, which is used to construct and evaluate JavaScript. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are likely responsible for downloading and executing a second-stage 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` `ebad4decda1d7e7b801a4cba90d748cca477072c34600136661bc25401d44d8b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12379 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `a6753f4a73072a4d7a71ce6c7d817b6eceba6141238c9bba5911fcba6bf9e98b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5077 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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