PDF malware analysis — malicious · b1f178ad3d6d5aa4

MALICIOUS

PDF

8.0 KB

MD5: 7909d5ea85fcc8d7d3883dfadd9cba64 SHA-1: 8d536370b6e0ff9115be78594f682c937193f007 SHA-256: b1f178ad3d6d5aa4c0ec256172003e7d010e134c134279f69f4b11e5ddea1158

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode(), suggesting obfuscation. The primary function of the script appears to be downloading and executing a second-stage payload from a remote source, as evidenced by the obfuscated JavaScript streams. The specific URLs or execution commands are not directly reconstructible due to the obfuscation, but the presence of these techniques strongly indicates a malicious downloader.

Heuristics 5

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_obj0004_000.js` `49a8296edabb278e6e6e2b58192ba27e1f37ccc3bf2b26ffc6d3c2a0c5683ce8`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `f08ab624d6ca3406fc43b60db8e3b432c370598d722a25e5ffd6b328e465cd97`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AD6	1597 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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