PDF malware analysis — malicious · d5b22b1aac691517

MALICIOUS

PDF

118.6 KB

MD5: 71b1ece9f469e0ec7a5d34b56513c3f6 SHA-1: 95e2a70af1137f21a9e3b964f993429f9ad4a166 SHA-256: d5b22b1aac691517db1523607c492f9264d08a766a4772a06a0c0b992c192f9f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple JavaScript streams, with one exhibiting a large comment-padded eval stager. This indicates the script is likely a downloader or stager for further malicious activity. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports the malicious nature of the file, suggesting it exploits PDF vulnerabilities to deliver a payload.

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` `a2e40e428e6c91bc1e2e001ee739f16e8e23274a3fbda2e1cb30e8a6e7fb9dba`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626653 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` `231aef1a7ebc1084cb245cd1b37241733d584184906d42abad2426e6be8bf10d`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 644 long base64-like blob(s).

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