PDF / .TXT malware analysis — malicious · 40f013fb53a51070

MALICIOUS

PDF / .TXT

13.2 KB

MD5: d34e5e10674fb4a9bfa4b3c932c318aa SHA-1: 72855e70bb1ea1f930d051ee883e2f7757c8b557 SHA-256: 40f013fb53a5107064c6c6d596be6cd488d55c958d058fe22bdcacf6aa72c4c1

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2007_5659 heuristic indicates the exploitation of a known vulnerability (Collab.collectEmailInfo) to execute JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of deobfuscated JavaScript files (legacy_pdfkit_stage_000.js, legacy_pdfkit_stage_001.js) and the ClamAV detection of Pdf.Exploit.Agent-36064. The document body was unreadable, but the technical indicators strongly suggest an exploit delivery mechanism.

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` `90eef94736ef85b06a8796af5e2d2aa6bd1b1f3c5209a23ea47e462aecdbfe5d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `4e74bbee0bdcd57f5713e274f55993101b1458c27ffdcf4ba4cb8dea1c26527d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5114 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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