PDF malware analysis — malicious · efc2d9a1561175b2

MALICIOUS

PDF

12.3 KB

MD5: 3853b1f7270fdc9b91b0cb4630178bba SHA-1: 44687a8c62c8af9acf6f9943d54bfe84b5f274d7 SHA-256: efc2d9a1561175b25b5fd1fb482d491edfaa874b4373dfd23dfac8c3517d6985

138 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, identified as malicious by ClamAV (Pdf.Exploit.Agent-36062). Heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo function, which concatenates and evaluates JavaScript. This suggests the PDF is designed to download and execute a secondary payload. The deobfuscated JavaScript files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' were also extracted, further supporting the malicious intent.

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` `89f9d479f0cbb81bfbef04a588c63ba11cb9bb46ee04a79885185041964990c3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	11949 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `8f6331ed7b3859a21cfaf36fb7c404bcebae09d2547b974888655c03b2f2c0bf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	4968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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