PDF malware analysis — malicious · e49b4b5195ed0fa1

MALICIOUS

PDF

12.7 KB

MD5: d90fde3b7361b85cd32180edb8d0ca1f SHA-1: 462bdc3b26ce7db235ffd1c6ba429186d74fe834 SHA-256: e49b4b5195ed0fa1c32913602d656787da302f1f79c594dd411dfa5157c63daa

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, which is known to exploit CVE-2007-5659 using the Collab.collectEmailInfo method. The extracted JavaScript streams, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, indicate a multi-stage process. The primary purpose appears to be the execution of this JavaScript to download and run a secondary payload, as suggested by the heuristic firings and the nature of the extracted files.

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` `92332272891e2eed9bb273f9f1fb11434cd79d756647812fb8264b153374ba15`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `0b62f7abd5762c1a7f85d41ae585a70f94eef20207a2e63c46ee419128dc0796`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5234 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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