PDF malware analysis — malicious · fc6e459eb9042c52

MALICIOUS

PDF

9.3 KB

MD5: 9318dda4b49c7788b67975564ce8b52b SHA-1: 39d9f0cd9de82cca04594fdff5940aa80aa34d83 SHA-256: fc6e459eb9042c523fc1d233b5f38c1f6356d4bdc3feb69154364e2ef19835c9

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link or Host T1059.003 Windows Command Shell

The file is a PDF containing embedded JavaScript, which is being used to exploit the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. The JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection of Pdf.Exploit.Agent-35905 further supports the malicious nature of the file.

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` `05a8a101e2e8dc383be5c25dea7ff2cad5c56ce13e89854752cf067e8c155c5c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11821 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` `bbdb18a73ea1baba78cc640bbf1472e9ab97e8417e251f41e427408de11fedaf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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