PDF / .TXT malware analysis — malicious · b8b03c691569ca00

MALICIOUS

PDF / .TXT

2.0 KB

MD5: 10eba05b81a13f6ad53cad35715528ff SHA-1: f5b9a2d5d0e8d3f3d9a37c11def891e15d91aec8 SHA-256: b8b03c691569ca00bf67eb248d6a417fee9bfcdd34e3df3322b7bcbcc56e3919

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. Critical firings indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and a ClamAV detection signature (Pdf.Exploit.Agent-35930). The embedded JavaScript, particularly the deobfuscated stream, likely facilitates the execution of a second-stage payload by leveraging eval() and unescape() functions. The obfuscated nature of the script and the lack of specific IOCs beyond the CVE identifier prevent a more precise family attribution.

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 0x6D9	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` `b882eaf119f36c7b720e6e3a6c99760e94bdc4ebf42cc15fe837decf3f5e5598`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2646 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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