PDF malware analysis — malicious · 1b4a9e450a39a2f4

MALICIOUS

PDF

12.6 KB

MD5: 9bbcad23dfc44be9b6eeeee7af202130 SHA-1: d97f2c37cd0dc4d817d7dc4daed6924201d7a1da SHA-256: 1b4a9e450a39a2f48f5e5151e18b0021692734e747f2e39abc40637ab3376894

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript that exploits the CVE-2007-5659 vulnerability, specifically using the Collab.collectEmailInfo method. This exploit is designed to execute arbitrary JavaScript, which in this case is further obfuscated and split into multiple files. The primary function of the embedded scripts is to download and execute a second-stage payload, as indicated by the heuristic firings and the nature of the extracted JavaScript files.

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` `c126a613349ab12ed74c762366cdd66e5b0324c530252dfcd483d0b1d35098b2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12235 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1c61f4c0d0b5709c3d0e8de9452d9fdd103257cbb95ba598a514fbb520352512`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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