PDF malware analysis — malicious · 543d043b7bb4752f

MALICIOUS

PDF

11.9 KB

MD5: 9d82572df19e762703702b1c8f77809b SHA-1: 2a1babc43c5a450d1fc37018ea046e213a5b16e3 SHA-256: 543d043b7bb4752ff7e1d3f582588a291539a6b38f09f8e37380ffacf2174782

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the Collab.collectEmailInfo method to exploit CVE-2007-5659. This JavaScript is further obfuscated and split into multiple streams, indicating an attempt to evade detection. The primary function of the embedded script appears to be the download and execution of additional malicious content, as suggested by the presence of deobfuscated JavaScript files named 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'.

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` `b48d2988c4f6f3bdd28132d0fca91c247805c27f97abb0444d34d541afd36219`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12143 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b3071d4d8e7ceb37c262260193d119f09a49c617e8b65638a8f4f2b0882dc914`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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