PDF malware analysis — malicious · 4891bafcf873d35c

MALICIOUS

PDF

12.6 KB

MD5: fb2621ec218fb1b2b47aa4f58559b93c SHA-1: 9655f4e6c50fcc8801b7b35906a17cde84ec2782 SHA-256: 4891bafcf873d35ce086b26f5035830f09b4affe971732cb3b3a6c3719d8a24c

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' for JavaScript execution, a known method for exploiting PDF vulnerabilities. The file was also detected by ClamAV as 'Pdf.Exploit.Agent-36062'. The embedded JavaScript is 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-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` `c7b38709f1bf13073e1d348e61081596a506dc71bf232a2ef12471363128ce76`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `96aa657cf0339f641e9adfafc84bd9586ca6b8b34c8f18b6876fb5c82b6ffbc1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5131 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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