PDF malware analysis — malicious · c7b6c775f1b76894

MALICIOUS

PDF

2.4 KB

MD5: 36e56742bafea17bfafdbc7b3ca9a9cb SHA-1: 1976a264a209bdcc3a400042ee0c362825b70ec8 SHA-256: c7b6c775f1b7689445af55d0c23194dcb3d8fe90da7abccadb2cc513739b76ee

218 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicative of obfuscation. Critical heuristics identify the use of `Collab.collectEmailInfo` for CVE-2007-5659, a known vulnerability in Adobe Reader. The embedded JavaScript streams, `javascript_obj111611_000.js` and `legacy_pdfkit_stage_000.js`, likely contribute to the exploit chain, potentially downloading and executing a secondary payload. The ClamAV detection further confirms its malicious nature.

Heuristics 7

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-35930 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35930
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `f23e505f155bfa9b9f356fa9fddf8d7fcafcc37fc2df3878e575e72c00c819d4`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x894	697 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `c8f75641c77cf940baf5c071ba19907509e28c88ad9e9a40b9a262c7b6b9535c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	3878 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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