PDF malware analysis — malicious · a6d5d5bc7e79b516

MALICIOUS

PDF

9.0 KB

MD5: b9ed4aecc23ea7b666502879a20918f5 SHA-1: 4fda2093bb0b44827730c49ed482ae4a19f75fb9 SHA-256: a6d5d5bc7e79b516a630d411448a320e9ef2689e04bf2eca0b08b5a39d24c880

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The file is a PDF containing embedded JavaScript, which is being used to exploit CVE-2007-5659 via the Collab.collectEmailInfo method. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. ClamAV also detected this file as Pdf.Exploit.Agent-35905, further indicating malicious intent.

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` `ce20f9d8ef4e84a191a658818e792fccf9db8ae89287ac86d884d2fa3581b531`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11708 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` `52246bbc452acb6de1066deb2b9b33e5af09abf64001ea58aadc784f48e873d4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4859 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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