PDF malware analysis — malicious · 77cb39804107f015

MALICIOUS

PDF

9.6 KB

MD5: 64bad21a88b737e2e3f1a5cfda2e36d1 SHA-1: cdb82e9cbd9e6acb3ae0866f1144ea1f445d936c SHA-256: 77cb39804107f01515412dc387e86b776f044677caff240e83d222bc5d8e42e4

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The critical heuristic CVE_2007_5659 indicates exploitation of a known vulnerability in PDF documents. This vulnerability is associated with the Collab.collectEmailInfo method and is used to execute embedded JavaScript. The presence of multiple JavaScript streams and deobfuscated JS files further supports this. The primary attack vector appears to be exploiting this PDF vulnerability to run malicious scripts, likely to download and execute additional malware.

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` `d09765d0a864991d89938332d538de888ffa1a50a792b967e0019471f1541b31`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	12348 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` `f1a2232f2e895ea2da6c2097bff393997aa6676c61c85ba1716cef4ae25efa7d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2FE	5214 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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