PDF malware analysis — malicious · 8b05dc29f83e2b5c

MALICIOUS

PDF

12.6 KB

MD5: b6286e9d5a8ae16d6b0499a5fd0a1890 SHA-1: 449b0cfe7893569d15b79a6eea43ff2cfac40fcf SHA-256: 8b05dc29f83e2b5c5db1d0baa62d3d059d861efb7af260503314722b56b63691

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2007_5659' heuristic specifically points to the use of the 'collab.collectEmailInfo' JavaScript function, which is known to be used in exploits. This function is used to concatenate information fields and extract characters at a fixed stride, which is then evaluated. This process is designed to execute arbitrary JavaScript, likely for downloading and executing a second-stage payload. The file is also flagged by ClamAV as 'Pdf.Exploit.Agent-36062'.

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` `352beca9cf894996a672d84e47583a01d1bdb8dd1962724716d7bdc7fb39aa41`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `ac94b3b4c19a73abd033c1a11e3e815ae99170c5652c81b6be0b3abdeb33d1f4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5147 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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