PDF malware analysis — malicious · 91b78e67b250ac64

MALICIOUS

PDF

11.8 KB

MD5: fefbfbc14871e86db1ec17117ca1bf8f SHA-1: 7bbf7c6c3b096f472c020dd56da6ce2e13bb47cf SHA-256: 91b78e67b250ac644edf7bae774a07f792b757be7764f654086b097e9cb32c5e

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'CVE_2007_5659' heuristic specifically points to the use of 'Collab.collectEmailInfo' to execute JavaScript, a known technique for exploiting PDF vulnerabilities. The extracted JavaScript files, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js', suggest a multi-stage exploit. The overall pattern indicates a malicious PDF designed to deliver further 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-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` `295e13f8e87d05394a9743f0b2f4deb2bdf7ad0b80fbf5aa026546fe6da70417`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12060 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2071d1818b01399ae5d9f9c440265d12ebb94d1a34c1892c2bfb574ec926c73f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4913 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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