PDF malware analysis — malicious · ecc90b9183acb28d

MALICIOUS

PDF

9.0 KB

MD5: 076fde8efa2b70e5b0c53c4a02893cf4 SHA-1: 2dcc1b96c1f48d91e2bc4f8c0dc16e942acd1314 SHA-256: ecc90b9183acb28d2631df67e73a4e2320b68fe413ac36f663e89ab2be0d08a6

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and utilizes the unescape function. Critical heuristics indicate exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, a known vulnerability for PDF exploits. ClamAV also detected this as Pdf.Exploit.Agent-35905. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact nature of the payload could not be determined due to obfuscation.

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` `3083d728ac79078dd5479a77fe0cf07cdf4dde1150ba09b7f03840c02485d64b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11491 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` `a457ee458a873b061bed25725296630f6cd4def2b6cdfae861e5496430775a70`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4820 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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