PDF malware analysis — malicious · c60fbe74ec0b5fb6

MALICIOUS

PDF

9.2 KB

MD5: b952546d6fed40055c327dea0d5698c3 SHA-1: 6f17338676ca6773bdc169d17e38cd1d448a9b67 SHA-256: c60fbe74ec0b5fb66512914309082e65217b1a71ed7d0c4ede2a2595a3e3dcb6

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The heuristics indicate the use of unescape() and JavaScript streams, common in PDF exploits. The extracted JavaScript, particularly 'legacy_pdfkit_stage_000.js', likely downloads and executes a second-stage payload, as suggested by the file's malicious verdict and ClamAV detection as Pdf.Exploit.Agent-35905. The exact payload and delivery mechanism are not fully discernible from the provided scripts.

Heuristics 6

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `9268a243ab7f77ffc38e599d75f3d1c284fd539f7ff9eef84e21e04212b0f626`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11895 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `b96555425e333a57659ccd375e57e8411f222c011f11c36767fd268aa98dfa8c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4861 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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