PDF malware analysis — malicious · 243e42186d3cdc02

MALICIOUS

PDF

9.5 KB

MD5: 33a3959e6b9c4a041f0895165372b53a SHA-1: e24ac8c515f3f1b6b5fe755ca0e0ba44ac1236af SHA-256: 243e42186d3cdc020110caa44e6008b4cae304eeb03d02755328491027b3049e

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that contains embedded JavaScript, which is a common technique for exploiting PDF reader vulnerabilities. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known vulnerability. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated. The ClamAV detection further confirms its malicious nature.

Heuristics 6

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-35905 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35905
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `d8a6b4ad1abf04d0c4a4f89535cfb57f7312edef25c443f4e844c8ec9d0929dd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `1f44f6136ad65b55f3a91e65ec063c6a3b0e2e64ec2d02a9a72f1a4cbb761568`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12158 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `3f0c0af7491605f51bc3359a60424b1fd76a0f20e83a3fb06e1cbfa308c48a01`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5112 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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