PDF malware analysis — malicious · 2dcb5511e0de2aed

MALICIOUS

PDF

8.2 KB

MD5: be4b2e8698711cbe169becd7f84a1feb SHA-1: 837b556c8db3a72f70ac21f3b7dd850818b65e73 SHA-256: 2dcb5511e0de2aed77af2a2e8da42690fb70f2baa0470cc44ac8c5937967f98b

254 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript and triggers an OpenAction upon opening, indicating a malicious intent. Critical heuristics indicate the exploitation of CVE-2014-0496 via app.addToolButton/removeToolButton, a known vulnerability in Adobe Reader. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the 'Pdf.Dropper.Agent-7244347-0' ClamAV detection. The document body's content about weight loss is a lure to encourage the user to open the malicious PDF.

Heuristics 10

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-7244347-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7244347-0
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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_obj0001_000.js` `6ab676c30134e6743b20ffb8b5ae654ff8f4afb0740546618e126b58e33da42a`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	4836 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 13 eval/decoder/string-building token(s).
`stream_001_off0000178e.js` `d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x178E	1042 bytes
`font_00_type1_off00001c2c.bin` `c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b`	pdf-font-stream	PDF embedded font (type1) at offset 0x1C2C	97 bytes
`font_01_type1_off00001eb3.bin` `b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d`	pdf-font-stream	PDF embedded font (type1) at offset 0x1EB3	144 bytes

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