PDF malware analysis — malicious · 86397c4e76e00fe3

MALICIOUS

PDF

9.6 KB

MD5: c3b687e1702a498ba1584e744587ad39 SHA-1: ef85d525acebf256d61c3f486fc5288608b406c6 SHA-256: 86397c4e76e00fe3f2a2d84515d306eaf201b32328dd9b74396a634378b2d02a

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL T1071.001 Web Protocols

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. Critical heuristics highlight the use of CVE-2007-5659 (Collab.collectEmailInfo) and a ClamAV detection signature (Pdf.Exploit.Agent-35905), confirming exploitation. The JavaScript is heavily obfuscated and decoded using unescape(), suggesting it's designed to download and execute a secondary payload. The presence of multiple deobfuscated JS files further supports this. The primary attack vector is likely the exploitation of a PDF reader vulnerability.

Heuristics 6

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e02595c66d10fd081b9647ffd9cd2cfef0558ba070696fccb8e785c38cec8912`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12396 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d1bba5613f4accf95367e4649447335682f9c31e2cdc7d7213c53123450e6db3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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