PDF malware analysis — malicious · eca07735ba3de7bf

MALICIOUS

PDF

11.8 KB

MD5: 86ecf4ef1f75571d71c5f4a67b4dcc6b SHA-1: c002287376955b0b72cfefda634533c2bf78b4c3 SHA-256: eca07735ba3de7bf44442dce185ec9f4ffb9a04547a6a8ce7c82466acd2e277a

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_FROMCHARCODE'. A critical heuristic, 'CVE_2007_5659', specifically identifies the use of 'collab.collectEmailInfo' for JavaScript execution, a known method for exploiting PDF vulnerabilities. The presence of deobfuscated JavaScript streams further supports the execution of malicious code. The file is also flagged by ClamAV as 'Pdf.Exploit.Agent-36079'. The exact intent of the script is not fully discernible due to obfuscation, but it is designed to leverage the CVE-2007-5659 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-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` `9a7a37da489a526cb07d5ed8888f2284b58bade942468489057dabf3ba2b9a40`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12265 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `8c7164286a60efdb702d9b4b6dec783be3a54f1ee1a1d1f4f8b3002c142a230f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	5055 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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