PDF malware analysis — malicious · 21e3f95008dc4ce3

MALICIOUS

PDF

11.5 KB

MD5: d581280f13e1a15e438a61715309e0df SHA-1: 56184504c1159d3c845e1e34c4c3d5598e34641e SHA-256: 21e3f95008dc4ce3093780c78bd51c03ec34be4fb474dd2fdb3b014be54628f5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, identified by multiple heuristics as malicious. Specifically, the CVE-2007-5659 heuristic indicates the exploitation of a known PDF vulnerability using JavaScript. The presence of deobfuscated JavaScript files, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', suggests a multi-stage attack. The ClamAV detection further confirms its malicious nature. The exact payload or ultimate goal is not clear from the provided evidence, but the initial vector is clearly an exploit within the PDF.

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` `e656b70ac7b222b794ecf78bf4d598e39962ab5da47c4f10b540cf502360d74a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11780 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b67fdc64211b2eec1f89e85de0915e432ead61e722530007e6d459e7d08abf20`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4836 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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