PDF malware analysis — malicious · 218dda9beb0ff8a6

MALICIOUS

PDF

9.4 KB

MD5: 7682fbc61fc799bb3d949fc1417bf5a0 SHA-1: 4b708a650f92f79645121823f9d82b01deee2ead SHA-256: 218dda9beb0ff8a6d8a2e51554e29f90b20a767c2e32f7aca143ee88504bd892

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that is obfuscated and utilizes the `unescape()` function, indicating malicious intent. The critical heuristic `CVE_2007_5659` specifically points to the use of `Collab.collectEmailInfo` for exploiting this known vulnerability. The file is detected by ClamAV as `Pdf.Exploit.Agent-35905`, further confirming its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

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` `f5b004ae7f7ac84a7d9f569769a86c083df864ffe537b2ad41273161ed0a2ad5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12037 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` `5581fc77b9c67e56dd6362f3347c613d623ae65eab0afa2a343cda030656e6ef`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5043 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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