PDF malware analysis — malicious · 912a0f55dbc2b98c

MALICIOUS

PDF

12.1 KB

MD5: 388c7148c4b7b48616421bbf83e225a3 SHA-1: 7c15821688ea5d6b072814ff2fe1d9ff863a87e4 SHA-256: 912a0f55dbc2b98cd263fbce859977cbc807b0936f840b8f6a2336af9e3d84f5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'CVE_2007_5659'. The 'CVE_2007_5659' heuristic specifically mentions the use of 'Collab.collectEmailInfo' and indicates that the JavaScript is encoded and uses legacy exploit-kit techniques to hide malicious API calls. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js') further supports the conclusion that this file is designed to execute malicious code. The primary intent appears to be the execution of a second-stage payload, likely downloaded from a remote source, exploiting the CVE-2007-5659 vulnerability.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `6344d757bbfbb16d626c3e321738fa38287eeccb09a8b389e9bbc2fda3925f37`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	5094 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `a7c586c62effc5054aef2912ce795d3debe7f6a9dbade8ae9207c8d88b9df64f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	12239 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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