PDF malware analysis — malicious · cc1d5818d7275b38

MALICIOUS

PDF

9.1 KB

MD5: 51f08a737bc432133e4387056eb98029 SHA-1: 55a628795176a4e5960b69d02f6035686ef423f2 SHA-256: cc1d5818d7275b38aa402ce4f4e71e58ad86ec29ed66fe7692fd2f6f149d65cd

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file that contains embedded JavaScript, triggering multiple high and critical heuristics related to PDF exploits and JavaScript execution. Specifically, the CVE-2007-5659 heuristic indicates the use of the Collab.collectEmailInfo method to achieve arbitrary JavaScript execution. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. Confidence is high due to the critical heuristic firings and the clear exploitation of a known vulnerability.

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` `3d1ad03a0313ba18b187b6a6a325da00827fbbb847d36993e7b006aec85d92cb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11546 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` `b3e4b33bec9259f489cfe61f4b2abb2861deef859af0bd26739d55e137a9d1e2`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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