PDF / .TXT malware analysis — malicious · 4842a54e3e2aa979

MALICIOUS

PDF / .TXT

2.4 KB

MD5: 784def28c1c61b4554ed7b51dc1b3d9e SHA-1: e3ff8f63aa0911c2d8a76c160a5c5c74252b346d SHA-256: 4842a54e3e2aa9795b0294242670438cea7896fb97640985ac7d89153398954f

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Scripting: JavaScript T1204.001 Malicious Execution: User Execution: Malicious Link T1204.002 Malicious Execution: User Execution: Malicious File

This PDF file contains embedded JavaScript that is obfuscated using eval() and unescape() functions. The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method, a known exploit vector for CVE-2007-5659. This exploit likely downloads and executes a second-stage payload. The file is detected by ClamAV as Pdf.Exploit.Agent-35930.

Heuristics 7

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-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x8A1	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `65f7c567e109672dbe41d33ae951240e6705da0f4d796ab0ed6c91d7660cf488`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	3914 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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