PDF malware analysis — malicious · ef3da7fcd864d9ad

MALICIOUS

PDF

8.3 KB

MD5: ef2e0c4e1c61cb69dba9cc83cdcc3a37 SHA-1: f9c82de51900b409eb7e80fc3385a0a3d3ea8a04 SHA-256: ef3da7fcd864d9ad107e9fc5bbe3dcdecc881378bc8281b48833293ff629fa24

214 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2014-0496 (app.addToolButton/removeToolButton). This indicates the file is designed to exploit this vulnerability. The presence of JavaScript and the ClamAV detection 'Pdf.Dropper.Agent-7321768-0' strongly suggest the PDF acts as a dropper for further malicious activity, likely downloading and executing a second-stage payload. The document body's content about weight loss on Mars appears to be a lure.

Heuristics 9

app.addToolButton/removeToolButton — CVE-2014-0496 critical CVE exact CVE_2014_0496

PDF JavaScript combines app.addToolButton() and app.removeToolButton() with heap-spray shellcode markers — the public Adobe Reader/Acrobat ToolButton use-after-free exploit shape for CVE-2014-0496. (matched in decompressed stream)
ClamAV: Pdf.Dropper.Agent-7321768-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7321768-0
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `01099dbdcc927b11c7e4f761a4ad2340a3d7cfdeee396e84ae1e8e8feccde8da`	pdf-javascript-stream	PDF /JS object 5 at offset 0x276	4980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s).
`stream_001_off0000182e.js` `d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x182E	1042 bytes
`font_00_type1_off00001ccc.bin` `c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b`	pdf-font-stream	PDF embedded font (type1) at offset 0x1CCC	97 bytes
`font_01_type1_off00001f53.bin` `b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d`	pdf-font-stream	PDF embedded font (type1) at offset 0x1F53	144 bytes

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