PDF malware analysis — malicious · f5b0fef3da6274b2

MALICIOUS

PDF

12.1 KB

MD5: 1190e1952533104ebbc26a44696c9531 SHA-1: d21c78b645166f6d93afcb750ef9c80a34085503 SHA-256: f5b0fef3da6274b2bea29060c4fa7298e43ec2c12d0e6add82f8b3fb65551010

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability. This script is designed to deobfuscate and execute further stages, indicated by the extracted files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The primary function appears to be downloading and executing a second-stage payload, as suggested by the heuristic firings and the nature of the embedded scripts.

Heuristics 5

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `775766359501a4cbebbf69d733e19eaabf9a36eb8593a0fdbdd4be72517fd44d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	11811 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `5fc163890c5867de77b003cfb6319e040d65a89f65c3b72c63d4402ecf1942b7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	4788 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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