PDF malware analysis — malicious · 31ad086e2145f1ca

MALICIOUS

PDF

11.9 KB

MD5: b717d7f4b43b1bd999f6f7446480d994 SHA-1: 653176b2f3eb8f1d0e640bd8784bba43b231d19c SHA-256: 31ad086e2145f1ca6af9e38ce20252123dd6825e71265be1d6f848f3899b87d6

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The critical CVE_2007_5659 heuristic specifically points to the use of `Collab.collectEmailInfo` to execute JavaScript, which is a known method for exploiting PDF vulnerabilities. The extracted JavaScript artifacts, `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, suggest a multi-stage process typical of exploit kits. The primary function appears to be the execution of obfuscated JavaScript, likely to download and execute a secondary payload.

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` `ba2a416ea5f508335a3f1567bcd04f653c7e965a0d4e121c7db1a23b4ed750f7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12234 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `10f391651ac41570280d5e5aedf549d04c827ef83d02ba05a04da056512fe462`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	5067 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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