PDF malware analysis — malicious · 823b6276bbcfbe8f

MALICIOUS

PDF

8.9 KB

MD5: bd0ff62005d48e98b5645873582a2aff SHA-1: 0982e2240cf675230dbc6f0574ffbaeece63bec3 SHA-256: 823b6276bbcfbe8f075292a6b6075f0166c3b355862eb9155d8ac7fc6abdc773

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object T1059.003 Windows Command Shell

The file is a PDF containing embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. Critical firings indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) to execute JavaScript. This JavaScript is likely responsible for downloading and executing a secondary payload, as suggested by the deobfuscated JS streams and the ClamAV detection signature 'Pdf.Exploit.Agent-35905'. The attack pattern involves exploiting a known PDF vulnerability.

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` `578fe3a73966527d418ced20eb4982fb454982c6a34df34dc26697eb6209da5d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	11776 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` `e9bba5aa67d33ba864f7b8d3fb44157ca0a905c5e4df88485da3defa7c572d8b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	4925 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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