PDF malware analysis — malicious · 4c28ba838a7e77ad

MALICIOUS

PDF

9.2 KB

MD5: 5ae5e66489080b1b69a3b5de1fff9ea2 SHA-1: 5cb7287ec7d0702b2a2c47545e5421d8d793394b SHA-256: 4c28ba838a7e77ad0bcef3d91f5cb7b1210590de5ead28f223093380360bcced

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript

The file is a PDF containing embedded JavaScript, which is flagged as malicious by ClamAV (Pdf.Exploit.Agent-35905). The critical heuristic CVE_2007_5659 indicates the use of the Collab.collectEmailInfo method, a known vulnerability in older PDF readers. The embedded JavaScript, particularly the deobfuscated streams, likely facilitates the exploitation of this vulnerability to download and execute additional 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` `9225bfd7afdfe1b52aa40af640b26ba79a9546b6680557700950287d8caa54a9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11794 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` `a4dd49ea2bb25655177bb76f3dc9dbcd7a018d6a054b8b2c5bccc8d5b2b5a6f5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4924 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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