PDF malware analysis — malicious · c738ffb935d50183

MALICIOUS

PDF

12.6 KB

MD5: c3dc612695a934e705f143cbad08400d SHA-1: 5d735ea3304cb04e2f70332ccfdc511a6defe12f SHA-256: c738ffb935d50183f1f3121f6668953f6d7d5356077e3927118d370e338813f5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/Object: Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The JavaScript streams, identified as legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are indicative of an exploit kit attempting to download and execute a secondary payload. The critical heuristic firings and ClamAV detection strongly support this assessment.

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` `74723abb7f2e1f6df8ae2702210a9ff5574e17ebe7b3f66b482fe7367faa7e6f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12339 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `160e602c4e5a697ed0885de374f8c82a7a49a8e5666858413c498b6d3287663e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5149 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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