PDF malware analysis — malicious · 62345150f5e872e3

MALICIOUS

PDF

30.1 KB Created: 2009-06-01 19:36:29 Authoring application: dfrprwqrpq (via ptiqhnbft)

MD5: eb8210f3cd07e7aa7cb2c37187f000d6 SHA-1: 0ded55344b179e5676f5442e64adb9d5d4b962d7 SHA-256: 62345150f5e872e30d5d1700393fde97faa499510e70202c7841ae620f58c42f

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains obfuscated JavaScript, identified by heuristics such as PDF_JAVASCRIPT and PDF_JS_EXPLOIT_CLUSTER. The JavaScript uses String.fromCharCode to deobfuscate its content, which is typical for exploit delivery. This script is designed to download and execute a second-stage payload, indicating a malicious intent to compromise the user's system. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0012_000.js` `bc8bca1f6fe0bd4cae67b6e29299fa1f07dd1b95435bcf06638c3995d54d0414`	pdf-javascript-stream	PDF /JS object 12 at offset 0x34A	29356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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