PDF malware analysis — malicious · 90c11edb24fb1828

MALICIOUS

PDF

9.4 KB

MD5: 7a5f9334f9d67c4cb394889b599a2327 SHA-1: dcf9a3fd558de2c34e310a9ca7b3c7f2f9b74814 SHA-256: 90c11edb24fb18287be7a9eef059510342b49dbc314cdfc5db4d63c5a2c200fa

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is being used to exploit the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo function. This exploit is designed to execute arbitrary code. The presence of multiple deobfuscated JavaScript files and the ClamAV detection further confirm its malicious nature. The primary attack vector appears to be leveraging a known PDF vulnerability to achieve code execution.

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` `e439db6069fcf7f6d08c0ae0bdcf969820958639f5dd1f80f931aa664a733d03`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12127 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` `3fe3aabdf2f05f560f8a39919b3134ad5b86d854746ec4156bdeac9ef494970e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5109 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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