PDF / .TXT malware analysis — malicious · b372c6e3a97ffaaa

MALICIOUS

PDF / .TXT

2.0 KB

MD5: 2597f3df831edb9f0891bdfe08625dab SHA-1: c82d0c276f0f0e029bbc1f476fd706c2f6e74edd SHA-256: b372c6e3a97ffaaac6ee1f444cc9422919316bdc3b3a67ef2e80353858536a9a

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 utilizes `eval()` and `unescape()` functions, indicating obfuscation. The critical heuristic `CVE_2009_0927` specifically points to the exploitation of a vulnerability related to `Collab.getIcon`. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the deobfuscated JavaScript artifact and the ClamAV detection signature `Pdf.Exploit.Agent-35930`. The attack pattern is consistent with a malicious PDF designed to exploit a known vulnerability to achieve arbitrary code execution.

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 0x6CC	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` `c07cf782b4a25a983c14315d4dfa7d297dc151108baaf3baf5ca5fcf90b1d1f5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2631 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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