PDF malware analysis — malicious · 4b229b350fea572e

MALICIOUS

PDF

12.5 KB

MD5: 16da535246ad08e37d3bc915ed4198b7 SHA-1: 0b2d8d395c12fca71a6bd78b43b10a5902de2863 SHA-256: 4b229b350fea572e7cfd8c220f038d71c2b10ec8e4fe353b5fd2fcd9e4ebaed5

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. Critical heuristics identify the use of CVE-2007-5659, specifically the Collab.collectEmailInfo method, which is known to launch JavaScript. The presence of deobfuscated JavaScript files named 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' further supports that this file is designed to execute malicious code. The ClamAV detection of 'Pdf.Exploit.Agent-36062' confirms its malicious nature. The exact intent of the JavaScript is not fully discernible due to obfuscation, but it is likely to download and execute 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-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` `6f09c5f2eb4ac6f357b8091ef74cf79fc935528d3c5f4bf28ee2d9fe803ab5b0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12364 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d20c54506c4c7c6bc45cd599c4fd208eee85188dbe74bad5f84b09e6011f244a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5063 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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