PDF malware analysis — malicious · 88190a89bf9ca378

MALICIOUS

PDF

12.5 KB

MD5: deeea40d6f17b66f4a8a1dfc9a4518af SHA-1: 77e22a895d02356e996a45ecd9cbdac909a3e3b1 SHA-256: 88190a89bf9ca378bf022ee8dcc3ef1fd62eed9f14df1f99c3b2be0b13235d45

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript that exploits the CVE-2007-5659 vulnerability using the Collab.collectEmailInfo method. This JavaScript is further obfuscated and split into multiple streams, indicating an attempt to hide its malicious functionality. The heuristics suggest that this script is designed to download and execute a second-stage payload, as indicated by the ClamAV detection and the presence of deobfuscated JavaScript files. The extracted filenames 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' further support this. The attack pattern is consistent with a PDF-based exploit delivery mechanism.

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` `e6fc82b7f52efdddfe597a590bdee26c129e1bcdff88c9c5c5ef59f47332925e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d935f1ee6e832fbe44b63fbf04eac7b7fea46f9dbde34e914c545ab3039748c1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5069 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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