PDF malware analysis — malicious · 321602fc5b539d39

MALICIOUS

PDF

1.9 KB

MD5: 3caab1cf9c475fcc709cf8718a2f4526 SHA-1: e129dcccac5ccfba4e2b0c6116bd4e3f693ff1e2 SHA-256: 321602fc5b539d397acf316214ee370f888965982d23b17b92b8704f28743202

158 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link: Malicious File

The PDF file contains embedded JavaScript, which is obfuscated using `unescape()` and `eval()` calls. This JavaScript is likely responsible for exploiting a vulnerability within the PDF reader to execute arbitrary code. The ClamAV detection `Pdf.Exploit.Agent-35930` further confirms its malicious nature. The extracted JavaScript files, `javascript_obj111611_000.js` and `legacy_pdfkit_stage_000.js`, are artifacts of this exploit.

Heuristics 6

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 0x670	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` `4cfa25d3ad88e564b38541c1d06bfebea02c14e218ed397bd56dc6cd92d08a0b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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