PDF malware analysis — malicious · 446b126b3ee35bf3

MALICIOUS

PDF

2.0 KB

MD5: 16628f0326decc453df12a1da4d98b79 SHA-1: 39ffae0f312a806749a9a92cf7ff4e9555c92e15 SHA-256: 446b126b3ee35bf32b82f35c909caae4e5fc2d17bb5d6080b93a8b3a790e1b44

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is obfuscated and utilizes eval() and unescape() functions, indicating malicious intent. Specifically, the CVE-2007-5659 heuristic firing points to the exploitation of a known vulnerability related to the Collab.collectEmailInfo method. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are likely responsible for executing the exploit and potentially downloading 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 0x6CE	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` `1258ee5a61076dbea870faf49d111cbe25314a8909d52f50c8f5d14577d89c47`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2628 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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