PDF malware analysis — malicious · 50bb838c4958dde1

MALICIOUS

PDF

12.0 KB

MD5: 10dcd29d9cd02a129ec79c2a3bc953a4 SHA-1: 9092b2b0af48d01d6254161806f19a920dd219dc SHA-256: 50bb838c4958dde1d989c5fb28a29c6a52886fd958c41973fbcee96a97a8b5e3

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically triggering the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This JavaScript is further deobfuscated into two files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The presence of these deobfuscated scripts and the critical heuristic firings indicate that the PDF is designed to execute malicious code, likely downloading and running a second-stage payload. The ClamAV detection further confirms its malicious nature.

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `8bcf48f74a2931dbceecbc2744938014d17a4bb83e70e93df7de3577ed2b9fb1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12342 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `cdb04b86f0e6dc2d464514ec635d1db92d15198c279468bceceba3beab069132`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5082 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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