PDF malware analysis — malicious · f71a0efeccf06f21

MALICIOUS

PDF

1.9 KB

MD5: f1188331b16ba62d9e5950c47a0cfa03 SHA-1: 8ce10ce72b4848048b61833ed4820025a7ef4268 SHA-256: f71a0efeccf06f216a3d0eead888199e593abad8858a2fa72de3e64105aecb06

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information T1566.002 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection (Pdf.Exploit.Agent-35930). It contains embedded JavaScript with eval() and unescape() calls, indicating obfuscated code execution. The presence of two JavaScript files, one deobfuscated, suggests the script's primary purpose is to download and execute a second-stage payload. The attack pattern is consistent with a malicious PDF used for delivering malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 0x66C	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` `716aece0008786e5724c16d01ffeb5bf0027f1e258ba9a9bcd78a34be793ccaa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2822 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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