PDF / .TXT malware analysis — malicious · 97651f0ec4acfb31

MALICIOUS

PDF / .TXT

2.0 KB

MD5: 1ba98555b1a1dab6846f84a979aac05f SHA-1: 6d0eaf73d8929c5fde7fbf57225db7bdab221e0d SHA-256: 97651f0ec4acfb319d72155669ac2dae8742974391ab78e6aeafb0f20c68ed72

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript that is obfuscated using `eval()` and `unescape()` functions. The critical heuristic `CVE_2009_0927` indicates the exploitation of a known vulnerability in Adobe Reader related to `Collab.getIcon`. This JavaScript is likely designed to download and execute a second-stage payload, leveraging the identified CVE. The file is classified as malicious by ClamAV with the signature `Pdf.Exploit.Agent-35930`.

Heuristics 7

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (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 0x6C8	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` `59f51eb210fc86367854a33192b93a92ff045c74baf657460982c7117c8972de`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2625 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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