PDF malware analysis — malicious · 8fc3835a4f8de016

MALICIOUS

PDF

13.0 KB Created: 2012-10-20 14:16:22 -05:00 Authoring application: AMRITAv3.06_R02-08-2012 (www.amrita-ebook.org (via pdfTeX-1.40.10)

MD5: 44a564c6668ffbe577c2eefeb57e1f68 SHA-1: a301a641fe8bcb9bdcff97ecd03399ff08d55613 SHA-256: 8fc3835a4f8de016218ad524dacded7882ced9b00cee293f273df0398336e0cf

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call within the JavaScript stream suggests obfuscation and dynamic code execution. The primary intent appears to be downloading and executing a second-stage payload from the embedded JavaScript artifact 'javascript_obj0004_000.js'. The document body is heavily obfuscated and does not provide clear user-facing content, further supporting a malicious intent.

Heuristics 6

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)
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
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_obj0004_000.js` `bab682104e55807870f17d60041a11a9f6a2e6fc8f342459c9cd7eb8d5ddf6c1`	pdf-javascript-stream	PDF /JS object 4 at offset 0x10F	35867 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 eval/decoder/string-building token(s).
`font_00_type1_off000025a2.bin` `e3b644e141d5b5e5871ec659f544ccb7e35da870f4ca81abefc50f717ac245db`	pdf-font-stream	PDF embedded font (type1) at offset 0x25A2	3102 bytes

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