PDF malware analysis — malicious · 39e893d565d92ce1

MALICIOUS

PDF

11.5 KB

MD5: baae95dd093ef693ad18464ee7156fc7 SHA-1: 58bc63f3d35f28e25582a1adc0fc985e806e6edc SHA-256: 39e893d565d92ce10cbb75f35de3dc73252acdd4cf752fcb32da9f446fddf17c

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The critical heuristic CVE_2007_5659 indicates the exploitation of a known PDF vulnerability using JavaScript. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are likely responsible for executing malicious code. The ClamAV detection further confirms the malicious nature of the file. The primary attack vector appears to be leveraging the 'Collab.collectEmailInfo' method to achieve arbitrary JavaScript execution.

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `04c00c27115c3e5d543c89fd33025f880d8146ca22fc6f584d04343a225d687a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	11944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `1a1f707e712ee751626dbb31b664e9c429e992d47319b659dd29eb8f2bff2b5b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4907 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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