PDF malware analysis — malicious · 7ba4ff55e5fbf7bd

MALICIOUS

PDF

15.7 KB

MD5: c4e5fcc23ea23732fe0e969ca8b43cec SHA-1: 1fb40f7fafb933b5acde7f327226cdf8f8a944e7 SHA-256: 7ba4ff55e5fbf7bd1e9ec4f90ce171546e57e4f0ad3e8de41cffcf2360df836b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates the file is designed to execute malicious code upon opening. The presence of 'eval()' and 'String.fromCharCode' within the JavaScript streams strongly suggests code obfuscation and dynamic execution, typical of exploit stagers. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature, likely involving exploit delivery.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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_obj0006_000.js` `f873f42e711557dd6cb0c48f5ae1ede5a25e213c4a31ff7764d68e22116b94c4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424541 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `4e3edac7b1056942112d9524cdd1c1193fc9aa31be30e5ca386e06d0abcf47e8`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 612 long base64-like blob(s).

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