PDF malware analysis — malicious · a4743bea703021f9

MALICIOUS

PDF

8.9 KB Created: 2011-01-23 14:02:25 Authoring application: haw iff

MD5: a152b94274e29bb03ac29887d82f1630 SHA-1: 42d57eda0db6668cb9d3859706f746302d9a7adc SHA-256: a4743bea703021f982583cb4a79c4e55b0a7b565e535908ed19e0cff141f6ea9

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF sample contains a high-severity XFA form with executable script, flagged by ML classifiers as malicious. The embedded JavaScript file, 'legacy_pdfkit_stage_000.js', is likely responsible for executing the malicious payload. The presence of embedded files and XFA scripts indicates a common delivery mechanism for exploiting PDF vulnerabilities to download and execute further stages.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0012.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0xA90	84 bytes
`embedded_file_obj0003.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0xB41	228 bytes
`embedded_file_obj0002.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 2 at offset 0xC31	199 bytes
`embedded_file_obj0015.bin` `b47654cc8f60726f6775b24e321cdcdce70494fb1966bfe41854e03ecca59146`	pdf-embedded-file	PDF EmbeddedFile object 15 at offset 0xD23	154 bytes
`embedded_file_obj0004.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 4 at offset 0xDFD	77 bytes
`embedded_file_obj0013.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0xEA4	56 bytes
`embedded_file_obj0010.bin` `e899252ccc675814a711589cf84b845eba898ba53e1b4205eed29c7abe97cf4a`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x11DC	6455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `786265749fd2526925390b7ed8d41f10e81ae9509907e895a0e96c4537cbe163`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0x1408	6356 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 long base64-like blob(s).

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