PDF / .TXT malware analysis — malicious · a5fe3880de5f3434

MALICIOUS

PDF / .TXT

12.8 KB

MD5: 01b6ec85589a543060417df308218fed SHA-1: f59e2e34aaa07d9c412f112b4bdd91af8670e44b SHA-256: a5fe3880de5f343472aafe3ce7e3a668f0e6ac97e358185242d8c89fbcf3b54d

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: JavaScript T1059 Command and Scripting Interpreter

The file is identified as malicious by ClamAV (Pdf.Exploit.Agent-36064) and exhibits critical heuristic firings related to CVE-2007-5659, indicating exploitation of a PDF vulnerability. Embedded JavaScript streams were extracted, with two deobfuscated files (legacy_pdfkit_stage_000.js, legacy_pdfkit_stage_001.js) suggesting the execution of malicious code. The script's likely purpose is to download and execute a second-stage payload.

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-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `c9341671d5f403da049fd6d3e247dde04ccaec6a7995f46f2ccc1b7204244952`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	11829 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `51db6c3203a58e7bf7ef97095c37f2244d452d2d324145b4642ebc8716da6a8e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	4909 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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