PDF malware analysis — malicious · b20a01df86d9b816

MALICIOUS

PDF

9.5 KB

MD5: 0c838d9d0026f1feefc4a5285647c522 SHA-1: fcb6680378b69816b36cb09db4f923253cac2576 SHA-256: b20a01df86d9b8169d9812c546c3fc63bc34d8a2c1e594fadb6b0aa2c186a878

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, as indicated by the Collab.collectEmailInfo heuristic. The JavaScript is heavily obfuscated and appears to be designed to download and execute a second-stage payload. ClamAV also detected this file as Pdf.Exploit.Agent-35905, further confirming its malicious nature. The exact payload and its ultimate goal could not be determined due to the obfuscation.

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` `561bea34bfb968332b585729a16ada465a0065042f3f66ad05361a42f3809186`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12031 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` `5ac7a4e1c4618a28f3b2620c509006348f6cb2a8fff8da53c567d6cdca917d0f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5066 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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