PDF malware analysis — malicious · b78fbf4de5736c52

MALICIOUS

PDF

9.2 KB

MD5: d6b703d27f3d7cfa0e3dd261ad576b0d SHA-1: 92d7ca7726faca9251088097401077508990ca2e SHA-256: b78fbf4de5736c5253f20b7579e9f71b81f6f477c18ef380cf05150e608d2eda

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated and utilizes the unescape function, indicating malicious intent. The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) strongly suggests exploitation of this vulnerability. The extracted JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are large and complex, pointing towards a downloader or exploit loader. The ClamAV detection further confirms its malicious nature. The primary attack vector is likely the exploitation of the CVE-2007-5659 vulnerability to execute arbitrary JavaScript, which in turn is designed to download and execute further malicious content.

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` `5cc8a29103950d8976c83d9dac5e8551ce5a1d5b8e95c146f8da103d725f0641`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11540 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` `a5efba78f078d2ac21d9174b290696bf1203825f82f1e1f497e3c329636f2131`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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