PDF malware analysis — malicious · a717f3c2c6166256

MALICIOUS

PDF

43.3 KB Authoring application: PyPDF2

MD5: f11ff1bc3189050b74973ca435b77176 SHA-1: 7203a1164d0e1f90ff00256f8bfd005a9f67f8a8 SHA-256: a717f3c2c6166256f78fda039e1e1ddabdbd48ee48eef18db7c68552b534be0a

122 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. A high-confidence heuristic, 'PDF_JS_ACTIVEX_DOWNLOADER', indicates that the script is designed to download and execute a second-stage payload. The presence of 'deobfuscated.js' and 'javascript_obj0005_000.js' further supports the analysis of script execution. The document body mentions 'irs.gov', suggesting a lure to trick the user into interacting with the malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 6

PDF JavaScript ActiveX downloader high PDF_JS_ACTIVEX_DOWNLOADER

Decoded PDF JavaScript instantiates Windows ActiveX/COM objects to download a payload over HTTP, write it through ADODB.Stream, and execute it through WScript.Shell/rundll32-style process launch. This is commodity downloader behavior rather than a specific Acrobat CVE trigger.
Suspicious extracted artifact medium 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.
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.
External URI low PDF_URI

PDF contains an external URL action

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `fac88f74d4c2a5fc20cecaaa15c598459d96149286ed851a18b5359fa96a62cb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x19E	26275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `3212630189052ad2795b0c561f77ded0585a08982539f8dd2d9430fce6495603`	deobfuscated-js	PDF JavaScript deobfuscation pass	30942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.