PDF malware analysis — malicious · 37b89e57fe6a1b51

MALICIOUS

PDF

12.3 KB

MD5: 6703cc5495ec6ade953e404ee9617e77 SHA-1: 4fd1af6e264882a228a49b239e7db1cf2c2687de SHA-256: 37b89e57fe6a1b51a02201f835c38b14ad61a6af15f23b3724be65e7418a5998

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability, specifically using the Collab.collectEmailInfo method. This JavaScript is heavily obfuscated and uses String.fromCharCode to decode its payload. The primary intent appears to be the execution of malicious code, likely to download and run a secondary payload, as indicated by the critical heuristic firings and the nature of the exploit.

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-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 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` `91e7b05e50231bf05a6d22a5604f62303b83b2bc14403c409d55c45f85b3911a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12763 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `34975c0ba2320ddb75bbb9ac17a80b62ca4aa3bcd9214b2bdaa33d7152f01d83`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5268 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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