PDF / .TXT malware analysis — malicious · fc011bb97f5ac7c6

MALICIOUS

PDF / .TXT

1.9 KB

MD5: d0d9c0ff47e15ee715e4bea581489057 SHA-1: 6859025e5308b1644075a9110021e382affa9f35 SHA-256: fc011bb97f5ac7c684cd4a0c24a243d74523c4f1367da204b3b90e036480c28d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes eval() and unescape() functions, indicating obfuscation. The critical CVE-2007-5659 heuristic firing confirms the exploitation of a known vulnerability via the Collab.collectEmailInfo method. This JavaScript is likely designed to download and execute a second-stage payload, contributing to the malicious nature of the document.

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)
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `eb82ebaa33ef5ca9d3a32e3ff628722a2e10dd2b9454d9dd30223991ca165b4c`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x6D5	277 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` `d45de7606e1da947b08bb4e7e340903f6f2d0bd7331a7c2febd0a8f32e3019df`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2634 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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