PDF malware analysis — malicious · a86b5e27fa282f37

MALICIOUS

PDF

4.0 KB

MD5: 412391b11ab5b59ffeafba3f79447d18 SHA-1: 338dbbde4523fbf3eb235b972d916f09e57fbffa SHA-256: a86b5e27fa282f37a5034241a618970d2a0677838473348a6a7ab27796aa2b00

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation, including the use of eval() and String.fromCharCode(), as flagged by PDF_EVAL and PDF_FROMCHARCODE. The deobfuscated JavaScript, found in acroform_b64_00.js, likely attempts to download and execute a second-stage payload. The presence of these obfuscated scripts and the PDF structure strongly suggests a malicious intent, though the specific family cannot be determined.

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_obj0013_001.js` `a986c10cc2adc5b6e00639f2282a086d7740b3cedd1377bdf8bbcbfd4eed2049`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6317 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` `4f2c6865f256a7d2e8e73ce83ed16ff618590055f0433cd957a58547fc942b85`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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