PDF malware analysis — malicious · 315c9fe491b6c45c

MALICIOUS

PDF

5.1 KB

MD5: 31e84e9d85b631bd593a0209aae42b8f SHA-1: b3a8f425501cb7fee52de88488d3a423a2eb08ce SHA-256: 315c9fe491b6c45cbdaf0b700913c0fd2812e2caa3e394b79a77975996e90501

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscation and dynamic code execution. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the obfuscated script and the suspicious extracted artifact name 'javascript_obj68435_000.js'. The lack of specific IOCs like URLs or hashes prevents a more precise attribution.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj68435_000.js` `233cdbf9dab006d19ff9ed3be3f9fd78a07f0f43dcc06c1b7ae2269b92e6288e`	pdf-javascript-stream	PDF /JS object 68435 at offset 0x134	8346 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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