PDF malware analysis — malicious · 53aa3d22d1fc9573

MALICIOUS

PDF

4.0 KB

MD5: 65f78e40de41aa2e52b0f5214639caf4 SHA-1: 709f1de857a3d62448455aeb06881fdeaedd5389 SHA-256: 53aa3d22d1fc957352a2b8577d4a631ff4849beadeb95db07ccc0a08712cd60e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical ClamAV detection of 'Pdf.Dropper.Agent-1828753' strongly suggests its malicious nature. The presence of eval() and String.fromCharCode in the JavaScript streams points to obfuscation techniques commonly used to hide malicious actions, such as downloading and executing a second-stage payload. The extracted file names 'acroform_b64_00.js' and 'javascript_obj0013_001.js' further support the presence of JavaScript.

Heuristics 6

ClamAV: Pdf.Dropper.Agent-1828753 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828753
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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_obj0013_001.js` `bc54d0f0867e265d946127cc30815362e7aa9503ab1b4106811684ab28b6239f`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6321 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `2a4cc04f0128ef80bf8a82f82695a3bdba77c460118c880e62bc2d06b7499e28`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3587 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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