PDF malware analysis — malicious · b8ce7ed7b7ae60c9

MALICIOUS

PDF

11.6 KB

MD5: a0ea5b50e4eddcb6f1bb690af0ca930d SHA-1: 6c6e3290d97bb609d413b3b07983d054a6856782 SHA-256: b8ce7ed7b7ae60c9ad3f25f5b57ca30ee83e96bd771d1412dd54ddc5e4597a76

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 to execute arbitrary code. The heuristic firings indicate the use of JavaScript actions and embedded JS streams, specifically mentioning the 'Collab.collectEmailInfo' method associated with this CVE. The ClamAV detection further confirms its malicious nature. The embedded JavaScript is responsible for downloading and executing a second-stage payload, as indicated by the analysis of the deobfuscated JS streams.

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` `de674f9a417de58d265eb2f3a098118e032652f283d59efec901614e0b715ea5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12023 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `df79f5b0ecab3a398582ec9cd079f4c0b1ea6b64f6493ae617f14abee761496d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4908 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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