PDF malware analysis — malicious · dc5cb76a5eea60d9

MALICIOUS

PDF

8.4 KB

MD5: 4e80fcfd118f665defa528718c60956e SHA-1: 9dc519ee9f7a99ee0a2ca721f5d46b76eeafd2e2 SHA-256: dc5cb76a5eea60d982cf038c482c8f4613cc4eda177763985a27fc06599500af

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2007_5659 heuristic indicates the use of the Collab.collectEmailInfo method to execute decoded JavaScript, which is a known technique for exploiting PDF vulnerabilities. The embedded JavaScript streams, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', likely facilitate the download and execution of a second-stage payload, contributing to the malicious verdict.

Heuristics 4

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)
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_obj0001_000.js` `b339e8c1e55b1e71da1c850e530878ca0b452e5f9be152eb70523eee0c535980`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	46 bytes
`javascript_obj0013_001.js` `9dbf0a7a8999900c9f0fc46d818346b5358f35a8458dc503db65dc3431add6c6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x373	16510 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `9805df0c190494af263039d3001316c2c26aca9aacc1cc10f1f2a99fcf189809`	deobfuscated-js	reverse-string concatenation decoded JavaScript at offset 0x373	2043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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